A Whole Earth Telescope campaign on the pulsating subdwarf B binary system PG 1336−018 (NY Vir)
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Auteurs : D. Kilkenny [Afrique du Sud] ; M. D. Reed [États-Unis] ; D. O'Donoghue [Afrique du Sud] ; S. D. Kawaler [États-Unis] ; A. Mukadam [États-Unis] ; S. J. Kleinman [États-Unis] ; A. Nitta [États-Unis] ; T. S. Metcalfe [États-Unis] ; J. L. Provencal [États-Unis] ; T. K. Watson [États-Unis] ; D. J. Sullivan [Nouvelle-Zélande] ; T. Sullivan [Nouvelle-Zélande] ; R. Shobbrook [Australie] ; X. J. Jiang [République populaire de Chine] ; S. Joshi [Inde] ; B. N. Ashoka [Inde] ; S. Seetha [Inde] ; E. Leibowitz [Israël] ; P. Ibbetson [Israël] ; H. Mendelson [Israël] ; E. Meištas [Lituanie] ; R. Kalytis [Lituanie] ; D. Ališauskas [Lituanie] ; P. Martinez [Afrique du Sud] ; F. Van Wyk [Afrique du Sud] ; R. S. Stobie [Afrique du Sud] ; F. Marang [Afrique du Sud] ; S. Zola [Pologne] ; J. Krzesinski [Pologne] ; W. Ogłoza [Pologne] ; P. Moskalik [Pologne] ; R. Silvotti [Italie] ; A. Piccioni [Italie] ; G. Vauclair [France] ; N. Dolez [France] ; M. Chevreton [France] ; S. Dreizler [Allemagne] ; S. L. Schuh [Allemagne] ; J. L. Deetjen [Allemagne] ; J. Solheim [Norvège] ; J. M. Gonzalez Perez [Norvège] ; A. Ulla [Espagne] ; R. Stensen [Espagne] ; M. Manteiga [Espagne] ; O. Suarez [Espagne] ; M. Burleigh ; S. O. Kepler [Brésil] ; A. Kanaan [Brésil] ; O. Giovannini [Brésil]Source :
- Monthly Notices of the Royal Astronomical Society [ 0035-8711 ] ; 2003-11.
English descriptors
- KwdEn :
- Actual data, Additional constraints, Alias, Alias patterns, Alto, Amplitude, Amplitude changes, Amplitude spectrum, Amplitude units, Azimuthal order, Beijing, Binary, Binary orbit, Binary solution, Binary system, Brassard, Calar, Calar alto, Calar alto data, Cent coverage, Charpinet, Constraint, Core campaign, Core mass, Current data, Data sets, Data subsets, Data window, Different sites, Discovery data, Discovery observations, Discovery paper, Dominant frequencies, Eclipse, Effect variations, Error bars, Evolutionary models, Fontaine brassard, Formal errors, Fractional intensity, Fractional intensity units, Frequency, Frequency differences, Frequency range, Full data, Geometric cancellation, Half data sets, Internal structure, Iowa state university, Iron abundance, Kawaler, Kilkenny, Largest amplitude, Light curve, Light travel time, Lower panel, Main campaign, Many frequencies, Mcdonald, Mcdonald mcdonald, Mcdonald observatory, Mnras, More frequencies, Multisite campaign, Naini, Observatory, Orbital, Orbital period, Orbital phase, Orbital phase shifts, Orbital phases, Orbital size, Ordinate carets, Other frequencies, Periodogram, Periodogram analysis, Periodograms, Phase differences, Phase shift, Phase shifts, Photoelectric data, Photomultiplier data, Preliminary model, Present results, Primary eclipses, Pulsation, Pulsation amplitudes, Pulsation frequencies, Pulsation mode, Pulsation modes, Pulsation periods, Pulsation spectrum, Rotation period, Rotational splitting, Single site, Spectroscopic constraints, Spherical harmonics, Split components, Split modes, Stellar physics, Strongest frequencies, Such constraints, Suhora, Suhora observatory, Tenerife, Upper panel, Weaker frequencies, White light data, Whole earth telescope, Window functions, Zhang robinson.
- Teeft :
- Actual data, Additional constraints, Alias, Alias patterns, Alto, Amplitude, Amplitude changes, Amplitude spectrum, Amplitude units, Azimuthal order, Beijing, Binary, Binary orbit, Binary solution, Binary system, Brassard, Calar, Calar alto, Calar alto data, Cent coverage, Charpinet, Constraint, Core campaign, Core mass, Current data, Data sets, Data subsets, Data window, Different sites, Discovery data, Discovery observations, Discovery paper, Dominant frequencies, Eclipse, Effect variations, Error bars, Evolutionary models, Fontaine brassard, Formal errors, Fractional intensity, Fractional intensity units, Frequency, Frequency differences, Frequency range, Full data, Geometric cancellation, Half data sets, Internal structure, Iowa state university, Iron abundance, Kawaler, Kilkenny, Largest amplitude, Light curve, Light travel time, Lower panel, Main campaign, Many frequencies, Mcdonald, Mcdonald mcdonald, Mcdonald observatory, Mnras, More frequencies, Multisite campaign, Naini, Observatory, Orbital, Orbital period, Orbital phase, Orbital phase shifts, Orbital phases, Orbital size, Ordinate carets, Other frequencies, Periodogram, Periodogram analysis, Periodograms, Phase differences, Phase shift, Phase shifts, Photoelectric data, Photomultiplier data, Preliminary model, Present results, Primary eclipses, Pulsation, Pulsation amplitudes, Pulsation frequencies, Pulsation mode, Pulsation modes, Pulsation periods, Pulsation spectrum, Rotation period, Rotational splitting, Single site, Spectroscopic constraints, Spherical harmonics, Split components, Split modes, Stellar physics, Strongest frequencies, Such constraints, Suhora, Suhora observatory, Tenerife, Upper panel, Weaker frequencies, White light data, Whole earth telescope, Window functions, Zhang robinson.
Abstract
We present results from a multisite (‘Whole Earth Telescope’) photometric campaign on PG 1336−018, the close eclipsing binary system containing a pulsating subdwarf B (sdB) star. The main part of the campaign (1999 April) resulted in ∼172 h of observations, representing a coverage of about 47 per cent, and additional data were obtained outside the core campaign. Periodogram analysis shows that the light variations are dominated by three frequencies near 5757, 5585 and 5369 μHz (∼174, 179 and 186 s, respectively), although many frequencies are present, particularly in the range 5000–6000 μHz (∼200–170 s). We identify, with some confidence, 28 frequencies down to a semi‐amplitude of 0.0005 in fractional intensity (equivalent to about 0.5 mmag). It is clear that the pulsation frequencies of PG 1336−018 have changed substantially since the 1996 discovery observations were made, and that amplitude changes occur, at least in the dominant three frequencies, on relatively short time‐scales (of the order of a day). On the assumption that the pulsating star is phase‐locked in the binary system, we have searched for rotational splitting of frequencies near the orbital and half of the orbital period, but the results are confused by aliasing at those frequencies (due to the data gaps caused by the eclipses). A preliminary model qualitatively matches the distribution of frequencies in PG 1336−018, with some good individual correspondences, but cannot be considered adequate because geometric cancellation should hide some of the modes which are apparently detected. Analysis of the pulsations during eclipse recovers three of the strongest modes, but the limited eclipse data – which can, at best, be only about 9 per cent of the total – do not allow mode identification at this stage. Simulations indicate that an overall coverage of about 80 per cent would be required for this to be viable. An attempt was made to determine phase shifts in the pulsation frequencies as a way of directly measuring the size of the binary orbit, but the uncertainties in the method are comparable to the light travel time across the orbit (probably less than a second).
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DOI: 10.1046/j.1365-8711.2003.07007.x
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Provencal</name><affiliation wicri:level="1"><mods:affiliation>University of Delaware, Newark, DE 19716, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>University of Delaware, Newark, DE 19716</wicri:regionArea></affiliation></author><author><name sortKey="Watson, T K" sort="Watson, T K" uniqKey="Watson T" first="T. K." last="Watson">T. K. Watson</name><affiliation wicri:level="1"><mods:affiliation>Southwestern University, 1001 E. University Avenue, Georgetown, Texas 78626, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Southwestern University, 1001 E. University Avenue, Georgetown, Texas 78626</wicri:regionArea></affiliation></author><author><name sortKey="Sullivan, D J" sort="Sullivan, D J" uniqKey="Sullivan D" first="D. J." last="Sullivan">D. J. Sullivan</name><affiliation wicri:level="1"><mods:affiliation>School of Chemical and Physical Sciences, Victoria University of Wellington, PO Box 600, Wellington, New Zealand</mods:affiliation><country xml:lang="fr">Nouvelle-Zélande</country><wicri:regionArea>School of Chemical and Physical Sciences, Victoria University of Wellington, PO Box 600, Wellington</wicri:regionArea></affiliation></author><author><name sortKey="Sullivan, T" sort="Sullivan, T" uniqKey="Sullivan T" first="T." last="Sullivan">T. Sullivan</name><affiliation wicri:level="1"><mods:affiliation>School of Chemical and Physical Sciences, Victoria University of Wellington, PO Box 600, Wellington, New Zealand</mods:affiliation><country xml:lang="fr">Nouvelle-Zélande</country><wicri:regionArea>School of Chemical and Physical Sciences, Victoria University of Wellington, PO Box 600, Wellington</wicri:regionArea></affiliation></author><author><name sortKey="Shobbrook, R" sort="Shobbrook, R" uniqKey="Shobbrook R" first="R." last="Shobbrook">R. Shobbrook</name><affiliation wicri:level="1"><mods:affiliation>Chatterton Astronomy Department, School of Physics, University of Sydney, NSW 2006, Australia</mods:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>Chatterton Astronomy Department, School of Physics, University of Sydney, NSW 2006</wicri:regionArea></affiliation></author><author><name sortKey="Jiang, X J" sort="Jiang, X J" uniqKey="Jiang X" first="X. J." last="Jiang">X. J. Jiang</name><affiliation wicri:level="1"><mods:affiliation>National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China</mods:affiliation><country xml:lang="fr">République populaire de Chine</country><wicri:regionArea>National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012</wicri:regionArea></affiliation></author><author><name sortKey="Joshi, S" sort="Joshi, S" uniqKey="Joshi S" first="S." last="Joshi">S. Joshi</name><affiliation wicri:level="1"><mods:affiliation>State Observatory, Manora Peak, Naini Tal 263 129, India</mods:affiliation><country xml:lang="fr">Inde</country><wicri:regionArea>State Observatory, Manora Peak, Naini Tal 263 129</wicri:regionArea></affiliation></author><author><name sortKey="Ashoka, B N" sort="Ashoka, B N" uniqKey="Ashoka B" first="B. N." last="Ashoka">B. N. Ashoka</name><affiliation wicri:level="1"><mods:affiliation>Indian Space Research Organisation, Airport Road, Vimanapura, Bangalore 560 017, India</mods:affiliation><country xml:lang="fr">Inde</country><wicri:regionArea>Indian Space Research Organisation, Airport Road, Vimanapura, Bangalore 560 017</wicri:regionArea></affiliation></author><author><name sortKey="Seetha, S" sort="Seetha, S" uniqKey="Seetha S" first="S." last="Seetha">S. Seetha</name><affiliation wicri:level="1"><mods:affiliation>Indian Space Research Organisation, Airport Road, Vimanapura, Bangalore 560 017, India</mods:affiliation><country xml:lang="fr">Inde</country><wicri:regionArea>Indian Space Research Organisation, Airport Road, Vimanapura, Bangalore 560 017</wicri:regionArea></affiliation></author><author><name sortKey="Leibowitz, E" sort="Leibowitz, E" uniqKey="Leibowitz E" first="E." last="Leibowitz">E. Leibowitz</name><affiliation wicri:level="1"><mods:affiliation>Wise Observatory, Tel‐Aviv University, Tel‐Aviv 69978, Israel</mods:affiliation><country xml:lang="fr">Israël</country><wicri:regionArea>Wise Observatory, Tel‐Aviv University, Tel‐Aviv 69978</wicri:regionArea></affiliation></author><author><name sortKey="Ibbetson, P" sort="Ibbetson, P" uniqKey="Ibbetson P" first="P." last="Ibbetson">P. Ibbetson</name><affiliation wicri:level="1"><mods:affiliation>Wise Observatory, Tel‐Aviv University, Tel‐Aviv 69978, Israel</mods:affiliation><country xml:lang="fr">Israël</country><wicri:regionArea>Wise Observatory, Tel‐Aviv University, Tel‐Aviv 69978</wicri:regionArea></affiliation></author><author><name sortKey="Mendelson, H" sort="Mendelson, H" uniqKey="Mendelson H" first="H." last="Mendelson">H. Mendelson</name><affiliation wicri:level="1"><mods:affiliation>Wise Observatory, Tel‐Aviv University, Tel‐Aviv 69978, Israel</mods:affiliation><country xml:lang="fr">Israël</country><wicri:regionArea>Wise Observatory, Tel‐Aviv University, Tel‐Aviv 69978</wicri:regionArea></affiliation></author><author><name sortKey="Meistas, E" sort="Meistas, E" uniqKey="Meistas E" first="E." last="Meištas">E. Meištas</name><affiliation wicri:level="1"><mods:affiliation>Institute of Theoretical Physics and Astronomy, Goštauto 12, Vilnius 2600, Lithuania</mods:affiliation><country xml:lang="fr">Lituanie</country><wicri:regionArea>Institute of Theoretical Physics and Astronomy, Goštauto 12, Vilnius 2600</wicri:regionArea></affiliation></author><author><name sortKey="Kalytis, R" sort="Kalytis, R" uniqKey="Kalytis R" first="R." last="Kalytis">R. Kalytis</name><affiliation wicri:level="1"><mods:affiliation>Institute of Theoretical Physics and Astronomy, Goštauto 12, Vilnius 2600, Lithuania</mods:affiliation><country xml:lang="fr">Lituanie</country><wicri:regionArea>Institute of Theoretical Physics and Astronomy, Goštauto 12, Vilnius 2600</wicri:regionArea></affiliation></author><author><name sortKey="Alisauskas, D" sort="Alisauskas, D" uniqKey="Alisauskas D" first="D." last="Ališauskas">D. Ališauskas</name><affiliation wicri:level="1"><mods:affiliation>Institute of Materials Research and Applied Sciences, Vilnius University, Čiurlionio 29, Vilnius 2009, Lithuania</mods:affiliation><country xml:lang="fr">Lituanie</country><wicri:regionArea>Institute of Materials Research and Applied Sciences, Vilnius University, Čiurlionio 29, Vilnius 2009</wicri:regionArea></affiliation></author><author><name sortKey="Martinez, P" sort="Martinez, P" uniqKey="Martinez P" first="P." last="Martinez">P. Martinez</name><affiliation wicri:level="1"><mods:affiliation>South African Astronomical Observatory, PO Box 9, Observatory 7935, South Africa</mods:affiliation><country xml:lang="fr">Afrique du Sud</country><wicri:regionArea>South African Astronomical Observatory, PO Box 9, Observatory 7935</wicri:regionArea></affiliation></author><author><name sortKey="Van Wyk, F" sort="Van Wyk, F" uniqKey="Van Wyk F" first="F." last="Van Wyk">F. Van Wyk</name><affiliation wicri:level="1"><mods:affiliation>South African Astronomical Observatory, PO Box 9, Observatory 7935, South Africa</mods:affiliation><country xml:lang="fr">Afrique du Sud</country><wicri:regionArea>South African Astronomical Observatory, PO Box 9, Observatory 7935</wicri:regionArea></affiliation></author><author><name sortKey="Stobie, R S" sort="Stobie, R S" uniqKey="Stobie R" first="R. S." last="Stobie">R. S. Stobie</name><affiliation wicri:level="1"><mods:affiliation>South African Astronomical Observatory, PO Box 9, Observatory 7935, South Africa</mods:affiliation><country xml:lang="fr">Afrique du Sud</country><wicri:regionArea>South African Astronomical Observatory, PO Box 9, Observatory 7935</wicri:regionArea></affiliation></author><author><name sortKey="Marang, F" sort="Marang, F" uniqKey="Marang F" first="F." last="Marang">F. Marang</name><affiliation wicri:level="1"><mods:affiliation>South African Astronomical Observatory, PO Box 9, Observatory 7935, South Africa</mods:affiliation><country xml:lang="fr">Afrique du Sud</country><wicri:regionArea>South African Astronomical Observatory, PO Box 9, Observatory 7935</wicri:regionArea></affiliation></author><author><name sortKey="Zola, S" sort="Zola, S" uniqKey="Zola S" first="S." last="Zola">S. Zola</name><affiliation wicri:level="1"><mods:affiliation>Astronomical Observatory, Jagiellonian University, ul. Orla 171, 30–244 Kraków, Poland</mods:affiliation><country xml:lang="fr">Pologne</country><wicri:regionArea>Astronomical Observatory, Jagiellonian University, ul. Orla 171, 30–244 Kraków</wicri:regionArea></affiliation></author><author><name sortKey="Krzesinski, J" sort="Krzesinski, J" uniqKey="Krzesinski J" first="J." last="Krzesinski">J. Krzesinski</name><affiliation wicri:level="1"><mods:affiliation>Mt. Suhora Observatory, Kraków Pedagogical University, ul. Podchorçżych 2, Kraków, Poland</mods:affiliation><country xml:lang="fr">Pologne</country><wicri:regionArea>Mt. Suhora Observatory, Kraków Pedagogical University, ul. Podchorçżych 2, Kraków</wicri:regionArea></affiliation></author><author><name sortKey="Ogloza, W" sort="Ogloza, W" uniqKey="Ogloza W" first="W." last="Ogłoza">W. Ogłoza</name><affiliation wicri:level="1"><mods:affiliation>Mt. Suhora Observatory, Kraków Pedagogical University, ul. Podchorçżych 2, Kraków, Poland</mods:affiliation><country xml:lang="fr">Pologne</country><wicri:regionArea>Mt. Suhora Observatory, Kraków Pedagogical University, ul. Podchorçżych 2, Kraków</wicri:regionArea></affiliation></author><author><name sortKey="Moskalik, P" sort="Moskalik, P" uniqKey="Moskalik P" first="P." last="Moskalik">P. Moskalik</name><affiliation wicri:level="1"><mods:affiliation>Nicolas Copernicus Astronomical Centre, ul. Bartycka 18, 00‐716 Warszawa, Poland</mods:affiliation><country xml:lang="fr">Pologne</country><wicri:regionArea>Nicolas Copernicus Astronomical Centre, ul. Bartycka 18, 00‐716 Warszawa</wicri:regionArea></affiliation></author><author><name sortKey="Silvotti, R" sort="Silvotti, R" uniqKey="Silvotti R" first="R." last="Silvotti">R. Silvotti</name><affiliation wicri:level="1"><mods:affiliation>Osservatorio Astronomico di Capodimonte, Via Moiariello 16, I‐80131, Napoli, Italy</mods:affiliation><country xml:lang="fr">Italie</country><wicri:regionArea>Osservatorio Astronomico di Capodimonte, Via Moiariello 16, I‐80131, Napoli</wicri:regionArea></affiliation></author><author><name sortKey="Piccioni, A" sort="Piccioni, A" uniqKey="Piccioni A" first="A." last="Piccioni">A. Piccioni</name><affiliation wicri:level="1"><mods:affiliation>Dipartimento di Astronomia, Università di Bologna, Via Ranzani 1, I–40127 Bologna, Italy</mods:affiliation><country xml:lang="fr">Italie</country><wicri:regionArea>Dipartimento di Astronomia, Università di Bologna, Via Ranzani 1, I–40127 Bologna</wicri:regionArea></affiliation></author><author><name sortKey="Vauclair, G" sort="Vauclair, G" uniqKey="Vauclair G" first="G." last="Vauclair">G. Vauclair</name><affiliation wicri:level="1"><mods:affiliation>Université Paul Sabatier, Observatoire Midi‐Pyrénées, CNRS/UMR5572, 14 av. E. Belin, 31400 Toulouse, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>Université Paul Sabatier, Observatoire Midi‐Pyrénées, CNRS/UMR5572, 14 av. E. Belin, 31400 Toulouse</wicri:regionArea></affiliation></author><author><name sortKey="Dolez, N" sort="Dolez, N" uniqKey="Dolez N" first="N." last="Dolez">N. Dolez</name><affiliation wicri:level="1"><mods:affiliation>Université Paul Sabatier, Observatoire Midi‐Pyrénées, CNRS/UMR5572, 14 av. E. Belin, 31400 Toulouse, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>Université Paul Sabatier, Observatoire Midi‐Pyrénées, CNRS/UMR5572, 14 av. E. Belin, 31400 Toulouse</wicri:regionArea></affiliation></author><author><name sortKey="Chevreton, M" sort="Chevreton, M" uniqKey="Chevreton M" first="M." last="Chevreton">M. Chevreton</name><affiliation wicri:level="1"><mods:affiliation>Observatoire de Paris‐Meudon, DAEC, 92195, Meudon, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>Observatoire de Paris‐Meudon, DAEC, 92195, Meudon</wicri:regionArea></affiliation></author><author><name sortKey="Dreizler, S" sort="Dreizler, S" uniqKey="Dreizler S" first="S." last="Dreizler">S. Dreizler</name><affiliation wicri:level="1"><mods:affiliation>Institut für Astronomie und Astrophysik, Universität Tübingen, Sand 1, D–72076 Tübingen, Germany</mods:affiliation><country xml:lang="fr">Allemagne</country><wicri:regionArea>Institut für Astronomie und Astrophysik, Universität Tübingen, Sand 1, D–72076 Tübingen</wicri:regionArea></affiliation></author><author><name sortKey="Schuh, S L" sort="Schuh, S L" uniqKey="Schuh S" first="S. L." last="Schuh">S. L. Schuh</name><affiliation wicri:level="1"><mods:affiliation>Institut für Astronomie und Astrophysik, Universität Tübingen, Sand 1, D–72076 Tübingen, Germany</mods:affiliation><country xml:lang="fr">Allemagne</country><wicri:regionArea>Institut für Astronomie und Astrophysik, Universität Tübingen, Sand 1, D–72076 Tübingen</wicri:regionArea></affiliation></author><author><name sortKey="Deetjen, J L" sort="Deetjen, J L" uniqKey="Deetjen J" first="J. L." last="Deetjen">J. L. Deetjen</name><affiliation wicri:level="1"><mods:affiliation>Institut für Astronomie und Astrophysik, Universität Tübingen, Sand 1, D–72076 Tübingen, Germany</mods:affiliation><country xml:lang="fr">Allemagne</country><wicri:regionArea>Institut für Astronomie und Astrophysik, Universität Tübingen, Sand 1, D–72076 Tübingen</wicri:regionArea></affiliation></author><author><name sortKey="Solheim, J" sort="Solheim, J" uniqKey="Solheim J" first="J." last="Solheim">J. Solheim</name><affiliation wicri:level="1"><mods:affiliation>Institutt for Fysikk, Universitetet i Tromsø N‐9037, Tromsø, Norway</mods:affiliation><country xml:lang="fr">Norvège</country><wicri:regionArea>Institutt for Fysikk, Universitetet i Tromsø N‐9037, Tromsø</wicri:regionArea></affiliation></author><author><name sortKey="Gonzalez Perez, J M" sort="Gonzalez Perez, J M" uniqKey="Gonzalez Perez J" first="J. M." last="Gonzalez Perez">J. M. Gonzalez Perez</name><affiliation wicri:level="1"><mods:affiliation>Institutt for Fysikk, Universitetet i Tromsø N‐9037, Tromsø, Norway</mods:affiliation><country xml:lang="fr">Norvège</country><wicri:regionArea>Institutt for Fysikk, Universitetet i Tromsø N‐9037, Tromsø</wicri:regionArea></affiliation></author><author><name sortKey="Ulla, A" sort="Ulla, A" uniqKey="Ulla A" first="A." last="Ulla">A. Ulla</name><affiliation wicri:level="1"><mods:affiliation>Universidade de Vigo, Depto. de Fisica Aplicada, Facultade de Ciencias, Campus Marcosende‐Lagoas, 36200 Vigo, Spain</mods:affiliation><country xml:lang="fr">Espagne</country><wicri:regionArea>Universidade de Vigo, Depto. de Fisica Aplicada, Facultade de Ciencias, Campus Marcosende‐Lagoas, 36200 Vigo</wicri:regionArea></affiliation></author><author><name sortKey=" Stensen, R" sort=" Stensen, R" uniqKey=" Stensen R" first="R." last=" Stensen">R. Stensen</name><affiliation wicri:level="1"><mods:affiliation>Isaac Newton Group of Telescopes, E–37800 Santa Cruz de La Palma, Canary Islands, Spain</mods:affiliation><country xml:lang="fr">Espagne</country><wicri:regionArea>Isaac Newton Group of Telescopes, E–37800 Santa Cruz de La Palma, Canary Islands</wicri:regionArea></affiliation></author><author><name sortKey="Manteiga, M" sort="Manteiga, M" uniqKey="Manteiga M" first="M." last="Manteiga">M. Manteiga</name><affiliation wicri:level="1"><mods:affiliation>Depto. de Ciencias de la Navegación y de la Tierra E.S. Marina, Civil. Univ. de Coruña, Paseo de Ronda 51, E‐15011 A, Coruña, Spain</mods:affiliation><country xml:lang="fr">Espagne</country><wicri:regionArea>Depto. de Ciencias de la Navegación y de la Tierra E.S. Marina, Civil. Univ. de Coruña, Paseo de Ronda 51, E‐15011 A, Coruña</wicri:regionArea></affiliation></author><author><name sortKey="Suarez, O" sort="Suarez, O" uniqKey="Suarez O" first="O." last="Suarez">O. Suarez</name><affiliation wicri:level="1"><mods:affiliation>Depto. de Ciencias de la Navegación y de la Tierra E.S. Marina, Civil. Univ. de Coruña, Paseo de Ronda 51, E‐15011 A, Coruña, Spain</mods:affiliation><country xml:lang="fr">Espagne</country><wicri:regionArea>Depto. de Ciencias de la Navegación y de la Tierra E.S. Marina, Civil. Univ. de Coruña, Paseo de Ronda 51, E‐15011 A, Coruña</wicri:regionArea></affiliation></author><author><name sortKey="Burleigh, M" sort="Burleigh, M" uniqKey="Burleigh M" first="M." last="Burleigh">M. Burleigh</name><affiliation><mods:affiliation>Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH</mods:affiliation><wicri:noCountry code="subField">7RH</wicri:noCountry></affiliation></author><author><name sortKey="Kepler, S O" sort="Kepler, S O" uniqKey="Kepler S" first="S. O." last="Kepler">S. O. Kepler</name><affiliation wicri:level="1"><mods:affiliation>Instituto de Fisica, UFRGS, 91501‐900, Porto Alegre, RS, Brazil</mods:affiliation><country xml:lang="fr">Brésil</country><wicri:regionArea>Instituto de Fisica, UFRGS, 91501‐900, Porto Alegre, RS</wicri:regionArea></affiliation></author><author><name sortKey="Kanaan, A" sort="Kanaan, A" uniqKey="Kanaan A" first="A." last="Kanaan">A. Kanaan</name><affiliation wicri:level="1"><mods:affiliation>Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil</mods:affiliation><country xml:lang="fr">Brésil</country><wicri:regionArea>Universidade Federal de Santa Catarina, Florianópolis, SC</wicri:regionArea></affiliation></author><author><name sortKey="Giovannini, O" sort="Giovannini, O" uniqKey="Giovannini O" first="O." last="Giovannini">O. Giovannini</name><affiliation wicri:level="1"><mods:affiliation>Departamento de Física e Química, Universidade de Caxias do Sul, CEP 95001‐970, Caxias do Sul, RS, Brazil</mods:affiliation><country xml:lang="fr">Brésil</country><wicri:regionArea>Departamento de Física e Química, Universidade de Caxias do Sul, CEP 95001‐970, Caxias do Sul, RS</wicri:regionArea></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:94E603846857FDDC4B61DFABC0EF27F5CD52FB9D</idno><date when="2003" year="2003">2003</date><idno type="doi">10.1046/j.1365-8711.2003.07007.x</idno><idno type="url">https://api.istex.fr/document/94E603846857FDDC4B61DFABC0EF27F5CD52FB9D/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">001C25</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Corpus" wicri:corpus="ISTEX">001C25</idno><idno type="wicri:Area/Istex/Curation">001C25</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a" type="main">A Whole Earth Telescope campaign on the pulsating subdwarf B binary system PG 1336−018 (NY Vir)</title><author><name sortKey="Kilkenny, D" sort="Kilkenny, D" uniqKey="Kilkenny D" first="D." last="Kilkenny">D. Kilkenny</name><affiliation wicri:level="1"><mods:affiliation>South African Astronomical Observatory, PO Box 9, Observatory 7935, South Africa</mods:affiliation><country xml:lang="fr">Afrique du Sud</country><wicri:regionArea>South African Astronomical Observatory, PO Box 9, Observatory 7935</wicri:regionArea></affiliation><affiliation wicri:level="1"><mods:affiliation>E-mail: dmk@saao.ac.za</mods:affiliation><country wicri:rule="url">Afrique du Sud</country></affiliation></author><author><name sortKey="Reed, M D" sort="Reed, M D" uniqKey="Reed M" first="M. D." last="Reed">M. D. Reed</name><affiliation wicri:level="1"><mods:affiliation>Department of Physics, Astronomy and Material Science, SW Missouri State University, 901 S. National, Springfield, MO 65804, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Physics, Astronomy and Material Science, SW Missouri State University, 901 S. National, Springfield, MO 65804</wicri:regionArea></affiliation><affiliation wicri:level="1"><mods:affiliation>Department of Physics and Astronomy, Iowa State University, Ames IA50011, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Physics and Astronomy, Iowa State University, Ames IA50011</wicri:regionArea></affiliation></author><author><name sortKey="O Donoghue, D" sort="O Donoghue, D" uniqKey="O Donoghue D" first="D." last="O'Donoghue">D. O'Donoghue</name><affiliation wicri:level="1"><mods:affiliation>South African Astronomical Observatory, PO Box 9, Observatory 7935, South Africa</mods:affiliation><country xml:lang="fr">Afrique du Sud</country><wicri:regionArea>South African Astronomical Observatory, PO Box 9, Observatory 7935</wicri:regionArea></affiliation></author><author><name sortKey="Kawaler, S D" sort="Kawaler, S D" uniqKey="Kawaler S" first="S. D." last="Kawaler">S. D. Kawaler</name><affiliation wicri:level="1"><mods:affiliation>Department of Physics and Astronomy, Iowa State University, Ames IA50011, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Physics and Astronomy, Iowa State University, Ames IA50011</wicri:regionArea></affiliation></author><author><name sortKey="Mukadam, A" sort="Mukadam, A" uniqKey="Mukadam A" first="A." last="Mukadam">A. Mukadam</name><affiliation wicri:level="1"><mods:affiliation>Department of Astronomy, University of Texas, Austin, TX 78712, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Astronomy, University of Texas, Austin, TX 78712</wicri:regionArea></affiliation></author><author><name sortKey="Kleinman, S J" sort="Kleinman, S J" uniqKey="Kleinman S" first="S. J." last="Kleinman">S. J. Kleinman</name><affiliation wicri:level="1"><mods:affiliation>Department of Physics and Astronomy, Iowa State University, Ames IA50011, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Physics and Astronomy, Iowa State University, Ames IA50011</wicri:regionArea></affiliation><affiliation wicri:level="1"><mods:affiliation>Apache Point Observatory, PO Box 59, Sunspot, NM 88349, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Apache Point Observatory, PO Box 59, Sunspot, NM 88349</wicri:regionArea></affiliation></author><author><name sortKey="Nitta, A" sort="Nitta, A" uniqKey="Nitta A" first="A." last="Nitta">A. Nitta</name><affiliation wicri:level="1"><mods:affiliation>Department of Astronomy, University of Texas, Austin, TX 78712, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Astronomy, University of Texas, Austin, TX 78712</wicri:regionArea></affiliation><affiliation wicri:level="1"><mods:affiliation>Apache Point Observatory, PO Box 59, Sunspot, NM 88349, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Apache Point Observatory, PO Box 59, Sunspot, NM 88349</wicri:regionArea></affiliation></author><author><name sortKey="Metcalfe, T S" sort="Metcalfe, T S" uniqKey="Metcalfe T" first="T. S." last="Metcalfe">T. S. Metcalfe</name><affiliation wicri:level="1"><mods:affiliation>Department of Astronomy, University of Texas, Austin, TX 78712, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Astronomy, University of Texas, Austin, TX 78712</wicri:regionArea></affiliation><affiliation wicri:level="1"><mods:affiliation>Harvard‐Smithsonian Centre for Astrophysics, 60, Garden St., Cambridge MA 02138, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Harvard‐Smithsonian Centre for Astrophysics, 60, Garden St., Cambridge MA 02138</wicri:regionArea></affiliation></author><author><name sortKey="Provencal, J L" sort="Provencal, J L" uniqKey="Provencal J" first="J. L." last="Provencal">J. L. Provencal</name><affiliation wicri:level="1"><mods:affiliation>University of Delaware, Newark, DE 19716, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>University of Delaware, Newark, DE 19716</wicri:regionArea></affiliation></author><author><name sortKey="Watson, T K" sort="Watson, T K" uniqKey="Watson T" first="T. K." last="Watson">T. K. Watson</name><affiliation wicri:level="1"><mods:affiliation>Southwestern University, 1001 E. University Avenue, Georgetown, Texas 78626, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Southwestern University, 1001 E. University Avenue, Georgetown, Texas 78626</wicri:regionArea></affiliation></author><author><name sortKey="Sullivan, D J" sort="Sullivan, D J" uniqKey="Sullivan D" first="D. J." last="Sullivan">D. J. Sullivan</name><affiliation wicri:level="1"><mods:affiliation>School of Chemical and Physical Sciences, Victoria University of Wellington, PO Box 600, Wellington, New Zealand</mods:affiliation><country xml:lang="fr">Nouvelle-Zélande</country><wicri:regionArea>School of Chemical and Physical Sciences, Victoria University of Wellington, PO Box 600, Wellington</wicri:regionArea></affiliation></author><author><name sortKey="Sullivan, T" sort="Sullivan, T" uniqKey="Sullivan T" first="T." last="Sullivan">T. Sullivan</name><affiliation wicri:level="1"><mods:affiliation>School of Chemical and Physical Sciences, Victoria University of Wellington, PO Box 600, Wellington, New Zealand</mods:affiliation><country xml:lang="fr">Nouvelle-Zélande</country><wicri:regionArea>School of Chemical and Physical Sciences, Victoria University of Wellington, PO Box 600, Wellington</wicri:regionArea></affiliation></author><author><name sortKey="Shobbrook, R" sort="Shobbrook, R" uniqKey="Shobbrook R" first="R." last="Shobbrook">R. Shobbrook</name><affiliation wicri:level="1"><mods:affiliation>Chatterton Astronomy Department, School of Physics, University of Sydney, NSW 2006, Australia</mods:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>Chatterton Astronomy Department, School of Physics, University of Sydney, NSW 2006</wicri:regionArea></affiliation></author><author><name sortKey="Jiang, X J" sort="Jiang, X J" uniqKey="Jiang X" first="X. J." last="Jiang">X. J. 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Kalytis</name><affiliation wicri:level="1"><mods:affiliation>Institute of Theoretical Physics and Astronomy, Goštauto 12, Vilnius 2600, Lithuania</mods:affiliation><country xml:lang="fr">Lituanie</country><wicri:regionArea>Institute of Theoretical Physics and Astronomy, Goštauto 12, Vilnius 2600</wicri:regionArea></affiliation></author><author><name sortKey="Alisauskas, D" sort="Alisauskas, D" uniqKey="Alisauskas D" first="D." last="Ališauskas">D. Ališauskas</name><affiliation wicri:level="1"><mods:affiliation>Institute of Materials Research and Applied Sciences, Vilnius University, Čiurlionio 29, Vilnius 2009, Lithuania</mods:affiliation><country xml:lang="fr">Lituanie</country><wicri:regionArea>Institute of Materials Research and Applied Sciences, Vilnius University, Čiurlionio 29, Vilnius 2009</wicri:regionArea></affiliation></author><author><name sortKey="Martinez, P" sort="Martinez, P" uniqKey="Martinez P" first="P." last="Martinez">P. Martinez</name><affiliation wicri:level="1"><mods:affiliation>South African Astronomical Observatory, PO Box 9, Observatory 7935, South Africa</mods:affiliation><country xml:lang="fr">Afrique du Sud</country><wicri:regionArea>South African Astronomical Observatory, PO Box 9, Observatory 7935</wicri:regionArea></affiliation></author><author><name sortKey="Van Wyk, F" sort="Van Wyk, F" uniqKey="Van Wyk F" first="F." last="Van Wyk">F. Van Wyk</name><affiliation wicri:level="1"><mods:affiliation>South African Astronomical Observatory, PO Box 9, Observatory 7935, South Africa</mods:affiliation><country xml:lang="fr">Afrique du Sud</country><wicri:regionArea>South African Astronomical Observatory, PO Box 9, Observatory 7935</wicri:regionArea></affiliation></author><author><name sortKey="Stobie, R S" sort="Stobie, R S" uniqKey="Stobie R" first="R. S." last="Stobie">R. S. Stobie</name><affiliation wicri:level="1"><mods:affiliation>South African Astronomical Observatory, PO Box 9, Observatory 7935, South Africa</mods:affiliation><country xml:lang="fr">Afrique du Sud</country><wicri:regionArea>South African Astronomical Observatory, PO Box 9, Observatory 7935</wicri:regionArea></affiliation></author><author><name sortKey="Marang, F" sort="Marang, F" uniqKey="Marang F" first="F." last="Marang">F. Marang</name><affiliation wicri:level="1"><mods:affiliation>South African Astronomical Observatory, PO Box 9, Observatory 7935, South Africa</mods:affiliation><country xml:lang="fr">Afrique du Sud</country><wicri:regionArea>South African Astronomical Observatory, PO Box 9, Observatory 7935</wicri:regionArea></affiliation></author><author><name sortKey="Zola, S" sort="Zola, S" uniqKey="Zola S" first="S." last="Zola">S. Zola</name><affiliation wicri:level="1"><mods:affiliation>Astronomical Observatory, Jagiellonian University, ul. Orla 171, 30–244 Kraków, Poland</mods:affiliation><country xml:lang="fr">Pologne</country><wicri:regionArea>Astronomical Observatory, Jagiellonian University, ul. Orla 171, 30–244 Kraków</wicri:regionArea></affiliation></author><author><name sortKey="Krzesinski, J" sort="Krzesinski, J" uniqKey="Krzesinski J" first="J." last="Krzesinski">J. Krzesinski</name><affiliation wicri:level="1"><mods:affiliation>Mt. Suhora Observatory, Kraków Pedagogical University, ul. Podchorçżych 2, Kraków, Poland</mods:affiliation><country xml:lang="fr">Pologne</country><wicri:regionArea>Mt. Suhora Observatory, Kraków Pedagogical University, ul. Podchorçżych 2, Kraków</wicri:regionArea></affiliation></author><author><name sortKey="Ogloza, W" sort="Ogloza, W" uniqKey="Ogloza W" first="W." last="Ogłoza">W. Ogłoza</name><affiliation wicri:level="1"><mods:affiliation>Mt. Suhora Observatory, Kraków Pedagogical University, ul. Podchorçżych 2, Kraków, Poland</mods:affiliation><country xml:lang="fr">Pologne</country><wicri:regionArea>Mt. Suhora Observatory, Kraków Pedagogical University, ul. Podchorçżych 2, Kraków</wicri:regionArea></affiliation></author><author><name sortKey="Moskalik, P" sort="Moskalik, P" uniqKey="Moskalik P" first="P." last="Moskalik">P. Moskalik</name><affiliation wicri:level="1"><mods:affiliation>Nicolas Copernicus Astronomical Centre, ul. Bartycka 18, 00‐716 Warszawa, Poland</mods:affiliation><country xml:lang="fr">Pologne</country><wicri:regionArea>Nicolas Copernicus Astronomical Centre, ul. Bartycka 18, 00‐716 Warszawa</wicri:regionArea></affiliation></author><author><name sortKey="Silvotti, R" sort="Silvotti, R" uniqKey="Silvotti R" first="R." last="Silvotti">R. Silvotti</name><affiliation wicri:level="1"><mods:affiliation>Osservatorio Astronomico di Capodimonte, Via Moiariello 16, I‐80131, Napoli, Italy</mods:affiliation><country xml:lang="fr">Italie</country><wicri:regionArea>Osservatorio Astronomico di Capodimonte, Via Moiariello 16, I‐80131, Napoli</wicri:regionArea></affiliation></author><author><name sortKey="Piccioni, A" sort="Piccioni, A" uniqKey="Piccioni A" first="A." last="Piccioni">A. Piccioni</name><affiliation wicri:level="1"><mods:affiliation>Dipartimento di Astronomia, Università di Bologna, Via Ranzani 1, I–40127 Bologna, Italy</mods:affiliation><country xml:lang="fr">Italie</country><wicri:regionArea>Dipartimento di Astronomia, Università di Bologna, Via Ranzani 1, I–40127 Bologna</wicri:regionArea></affiliation></author><author><name sortKey="Vauclair, G" sort="Vauclair, G" uniqKey="Vauclair G" first="G." last="Vauclair">G. Vauclair</name><affiliation wicri:level="1"><mods:affiliation>Université Paul Sabatier, Observatoire Midi‐Pyrénées, CNRS/UMR5572, 14 av. E. Belin, 31400 Toulouse, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>Université Paul Sabatier, Observatoire Midi‐Pyrénées, CNRS/UMR5572, 14 av. E. Belin, 31400 Toulouse</wicri:regionArea></affiliation></author><author><name sortKey="Dolez, N" sort="Dolez, N" uniqKey="Dolez N" first="N." last="Dolez">N. Dolez</name><affiliation wicri:level="1"><mods:affiliation>Université Paul Sabatier, Observatoire Midi‐Pyrénées, CNRS/UMR5572, 14 av. E. Belin, 31400 Toulouse, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>Université Paul Sabatier, Observatoire Midi‐Pyrénées, CNRS/UMR5572, 14 av. E. Belin, 31400 Toulouse</wicri:regionArea></affiliation></author><author><name sortKey="Chevreton, M" sort="Chevreton, M" uniqKey="Chevreton M" first="M." last="Chevreton">M. Chevreton</name><affiliation wicri:level="1"><mods:affiliation>Observatoire de Paris‐Meudon, DAEC, 92195, Meudon, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>Observatoire de Paris‐Meudon, DAEC, 92195, Meudon</wicri:regionArea></affiliation></author><author><name sortKey="Dreizler, S" sort="Dreizler, S" uniqKey="Dreizler S" first="S." last="Dreizler">S. Dreizler</name><affiliation wicri:level="1"><mods:affiliation>Institut für Astronomie und Astrophysik, Universität Tübingen, Sand 1, D–72076 Tübingen, Germany</mods:affiliation><country xml:lang="fr">Allemagne</country><wicri:regionArea>Institut für Astronomie und Astrophysik, Universität Tübingen, Sand 1, D–72076 Tübingen</wicri:regionArea></affiliation></author><author><name sortKey="Schuh, S L" sort="Schuh, S L" uniqKey="Schuh S" first="S. L." last="Schuh">S. L. Schuh</name><affiliation wicri:level="1"><mods:affiliation>Institut für Astronomie und Astrophysik, Universität Tübingen, Sand 1, D–72076 Tübingen, Germany</mods:affiliation><country xml:lang="fr">Allemagne</country><wicri:regionArea>Institut für Astronomie und Astrophysik, Universität Tübingen, Sand 1, D–72076 Tübingen</wicri:regionArea></affiliation></author><author><name sortKey="Deetjen, J L" sort="Deetjen, J L" uniqKey="Deetjen J" first="J. L." last="Deetjen">J. L. Deetjen</name><affiliation wicri:level="1"><mods:affiliation>Institut für Astronomie und Astrophysik, Universität Tübingen, Sand 1, D–72076 Tübingen, Germany</mods:affiliation><country xml:lang="fr">Allemagne</country><wicri:regionArea>Institut für Astronomie und Astrophysik, Universität Tübingen, Sand 1, D–72076 Tübingen</wicri:regionArea></affiliation></author><author><name sortKey="Solheim, J" sort="Solheim, J" uniqKey="Solheim J" first="J." last="Solheim">J. Solheim</name><affiliation wicri:level="1"><mods:affiliation>Institutt for Fysikk, Universitetet i Tromsø N‐9037, Tromsø, Norway</mods:affiliation><country xml:lang="fr">Norvège</country><wicri:regionArea>Institutt for Fysikk, Universitetet i Tromsø N‐9037, Tromsø</wicri:regionArea></affiliation></author><author><name sortKey="Gonzalez Perez, J M" sort="Gonzalez Perez, J M" uniqKey="Gonzalez Perez J" first="J. M." last="Gonzalez Perez">J. M. Gonzalez Perez</name><affiliation wicri:level="1"><mods:affiliation>Institutt for Fysikk, Universitetet i Tromsø N‐9037, Tromsø, Norway</mods:affiliation><country xml:lang="fr">Norvège</country><wicri:regionArea>Institutt for Fysikk, Universitetet i Tromsø N‐9037, Tromsø</wicri:regionArea></affiliation></author><author><name sortKey="Ulla, A" sort="Ulla, A" uniqKey="Ulla A" first="A." last="Ulla">A. Ulla</name><affiliation wicri:level="1"><mods:affiliation>Universidade de Vigo, Depto. de Fisica Aplicada, Facultade de Ciencias, Campus Marcosende‐Lagoas, 36200 Vigo, Spain</mods:affiliation><country xml:lang="fr">Espagne</country><wicri:regionArea>Universidade de Vigo, Depto. de Fisica Aplicada, Facultade de Ciencias, Campus Marcosende‐Lagoas, 36200 Vigo</wicri:regionArea></affiliation></author><author><name sortKey=" Stensen, R" sort=" Stensen, R" uniqKey=" Stensen R" first="R." last=" Stensen">R. Stensen</name><affiliation wicri:level="1"><mods:affiliation>Isaac Newton Group of Telescopes, E–37800 Santa Cruz de La Palma, Canary Islands, Spain</mods:affiliation><country xml:lang="fr">Espagne</country><wicri:regionArea>Isaac Newton Group of Telescopes, E–37800 Santa Cruz de La Palma, Canary Islands</wicri:regionArea></affiliation></author><author><name sortKey="Manteiga, M" sort="Manteiga, M" uniqKey="Manteiga M" first="M." last="Manteiga">M. Manteiga</name><affiliation wicri:level="1"><mods:affiliation>Depto. de Ciencias de la Navegación y de la Tierra E.S. Marina, Civil. Univ. de Coruña, Paseo de Ronda 51, E‐15011 A, Coruña, Spain</mods:affiliation><country xml:lang="fr">Espagne</country><wicri:regionArea>Depto. de Ciencias de la Navegación y de la Tierra E.S. Marina, Civil. Univ. de Coruña, Paseo de Ronda 51, E‐15011 A, Coruña</wicri:regionArea></affiliation></author><author><name sortKey="Suarez, O" sort="Suarez, O" uniqKey="Suarez O" first="O." last="Suarez">O. Suarez</name><affiliation wicri:level="1"><mods:affiliation>Depto. de Ciencias de la Navegación y de la Tierra E.S. Marina, Civil. Univ. de Coruña, Paseo de Ronda 51, E‐15011 A, Coruña, Spain</mods:affiliation><country xml:lang="fr">Espagne</country><wicri:regionArea>Depto. de Ciencias de la Navegación y de la Tierra E.S. Marina, Civil. Univ. de Coruña, Paseo de Ronda 51, E‐15011 A, Coruña</wicri:regionArea></affiliation></author><author><name sortKey="Burleigh, M" sort="Burleigh, M" uniqKey="Burleigh M" first="M." last="Burleigh">M. Burleigh</name><affiliation><mods:affiliation>Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH</mods:affiliation><wicri:noCountry code="subField">7RH</wicri:noCountry></affiliation></author><author><name sortKey="Kepler, S O" sort="Kepler, S O" uniqKey="Kepler S" first="S. O." last="Kepler">S. O. Kepler</name><affiliation wicri:level="1"><mods:affiliation>Instituto de Fisica, UFRGS, 91501‐900, Porto Alegre, RS, Brazil</mods:affiliation><country xml:lang="fr">Brésil</country><wicri:regionArea>Instituto de Fisica, UFRGS, 91501‐900, Porto Alegre, RS</wicri:regionArea></affiliation></author><author><name sortKey="Kanaan, A" sort="Kanaan, A" uniqKey="Kanaan A" first="A." last="Kanaan">A. Kanaan</name><affiliation wicri:level="1"><mods:affiliation>Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil</mods:affiliation><country xml:lang="fr">Brésil</country><wicri:regionArea>Universidade Federal de Santa Catarina, Florianópolis, SC</wicri:regionArea></affiliation></author><author><name sortKey="Giovannini, O" sort="Giovannini, O" uniqKey="Giovannini O" first="O." last="Giovannini">O. Giovannini</name><affiliation wicri:level="1"><mods:affiliation>Departamento de Física e Química, Universidade de Caxias do Sul, CEP 95001‐970, Caxias do Sul, RS, Brazil</mods:affiliation><country xml:lang="fr">Brésil</country><wicri:regionArea>Departamento de Física e Química, Universidade de Caxias do Sul, CEP 95001‐970, Caxias do Sul, RS</wicri:regionArea></affiliation></author></analytic><monogr></monogr><series><title level="j" type="main">Monthly Notices of the Royal Astronomical Society</title><title level="j" type="alt">MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY</title><idno type="ISSN">0035-8711</idno><idno type="eISSN">1365-2966</idno><imprint><biblScope unit="vol">345</biblScope><biblScope unit="issue">3</biblScope><biblScope unit="page" from="834">834</biblScope><biblScope unit="page" to="846">846</biblScope><biblScope unit="page-count">13</biblScope><publisher>Blackwell Science Ltd</publisher><pubPlace> 23 Ainslie Place , Edinburgh EH3 6AJ , UK . Telephone (0131) 226 7232 Fax (0131) 226 3803 </pubPlace><date type="published" when="2003-11">2003-11</date></imprint><idno type="ISSN">0035-8711</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0035-8711</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Actual data</term><term>Additional constraints</term><term>Alias</term><term>Alias patterns</term><term>Alto</term><term>Amplitude</term><term>Amplitude changes</term><term>Amplitude spectrum</term><term>Amplitude units</term><term>Azimuthal order</term><term>Beijing</term><term>Binary</term><term>Binary orbit</term><term>Binary solution</term><term>Binary system</term><term>Brassard</term><term>Calar</term><term>Calar alto</term><term>Calar alto data</term><term>Cent coverage</term><term>Charpinet</term><term>Constraint</term><term>Core campaign</term><term>Core mass</term><term>Current data</term><term>Data sets</term><term>Data subsets</term><term>Data window</term><term>Different sites</term><term>Discovery data</term><term>Discovery observations</term><term>Discovery paper</term><term>Dominant frequencies</term><term>Eclipse</term><term>Effect variations</term><term>Error bars</term><term>Evolutionary models</term><term>Fontaine brassard</term><term>Formal errors</term><term>Fractional intensity</term><term>Fractional intensity units</term><term>Frequency</term><term>Frequency differences</term><term>Frequency range</term><term>Full data</term><term>Geometric cancellation</term><term>Half data sets</term><term>Internal structure</term><term>Iowa state university</term><term>Iron abundance</term><term>Kawaler</term><term>Kilkenny</term><term>Largest amplitude</term><term>Light curve</term><term>Light travel time</term><term>Lower panel</term><term>Main campaign</term><term>Many frequencies</term><term>Mcdonald</term><term>Mcdonald mcdonald</term><term>Mcdonald observatory</term><term>Mnras</term><term>More frequencies</term><term>Multisite campaign</term><term>Naini</term><term>Observatory</term><term>Orbital</term><term>Orbital period</term><term>Orbital phase</term><term>Orbital phase shifts</term><term>Orbital phases</term><term>Orbital size</term><term>Ordinate carets</term><term>Other frequencies</term><term>Periodogram</term><term>Periodogram analysis</term><term>Periodograms</term><term>Phase differences</term><term>Phase shift</term><term>Phase shifts</term><term>Photoelectric data</term><term>Photomultiplier data</term><term>Preliminary model</term><term>Present results</term><term>Primary eclipses</term><term>Pulsation</term><term>Pulsation amplitudes</term><term>Pulsation frequencies</term><term>Pulsation mode</term><term>Pulsation modes</term><term>Pulsation periods</term><term>Pulsation spectrum</term><term>Rotation period</term><term>Rotational splitting</term><term>Single site</term><term>Spectroscopic constraints</term><term>Spherical harmonics</term><term>Split components</term><term>Split modes</term><term>Stellar physics</term><term>Strongest frequencies</term><term>Such constraints</term><term>Suhora</term><term>Suhora observatory</term><term>Tenerife</term><term>Upper panel</term><term>Weaker frequencies</term><term>White light data</term><term>Whole earth telescope</term><term>Window functions</term><term>Zhang robinson</term></keywords><keywords scheme="Teeft" xml:lang="en"><term>Actual data</term><term>Additional constraints</term><term>Alias</term><term>Alias patterns</term><term>Alto</term><term>Amplitude</term><term>Amplitude changes</term><term>Amplitude spectrum</term><term>Amplitude units</term><term>Azimuthal order</term><term>Beijing</term><term>Binary</term><term>Binary orbit</term><term>Binary solution</term><term>Binary system</term><term>Brassard</term><term>Calar</term><term>Calar alto</term><term>Calar alto data</term><term>Cent coverage</term><term>Charpinet</term><term>Constraint</term><term>Core campaign</term><term>Core mass</term><term>Current data</term><term>Data sets</term><term>Data subsets</term><term>Data window</term><term>Different sites</term><term>Discovery data</term><term>Discovery observations</term><term>Discovery paper</term><term>Dominant frequencies</term><term>Eclipse</term><term>Effect variations</term><term>Error bars</term><term>Evolutionary models</term><term>Fontaine brassard</term><term>Formal errors</term><term>Fractional intensity</term><term>Fractional intensity units</term><term>Frequency</term><term>Frequency differences</term><term>Frequency range</term><term>Full data</term><term>Geometric cancellation</term><term>Half data sets</term><term>Internal structure</term><term>Iowa state university</term><term>Iron abundance</term><term>Kawaler</term><term>Kilkenny</term><term>Largest amplitude</term><term>Light curve</term><term>Light travel time</term><term>Lower panel</term><term>Main campaign</term><term>Many frequencies</term><term>Mcdonald</term><term>Mcdonald mcdonald</term><term>Mcdonald observatory</term><term>Mnras</term><term>More frequencies</term><term>Multisite campaign</term><term>Naini</term><term>Observatory</term><term>Orbital</term><term>Orbital period</term><term>Orbital phase</term><term>Orbital phase shifts</term><term>Orbital phases</term><term>Orbital size</term><term>Ordinate carets</term><term>Other frequencies</term><term>Periodogram</term><term>Periodogram analysis</term><term>Periodograms</term><term>Phase differences</term><term>Phase shift</term><term>Phase shifts</term><term>Photoelectric data</term><term>Photomultiplier data</term><term>Preliminary model</term><term>Present results</term><term>Primary eclipses</term><term>Pulsation</term><term>Pulsation amplitudes</term><term>Pulsation frequencies</term><term>Pulsation mode</term><term>Pulsation modes</term><term>Pulsation periods</term><term>Pulsation spectrum</term><term>Rotation period</term><term>Rotational splitting</term><term>Single site</term><term>Spectroscopic constraints</term><term>Spherical harmonics</term><term>Split components</term><term>Split modes</term><term>Stellar physics</term><term>Strongest frequencies</term><term>Such constraints</term><term>Suhora</term><term>Suhora observatory</term><term>Tenerife</term><term>Upper panel</term><term>Weaker frequencies</term><term>White light data</term><term>Whole earth telescope</term><term>Window functions</term><term>Zhang robinson</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">We present results from a multisite (‘Whole Earth Telescope’) photometric campaign on PG 1336−018, the close eclipsing binary system containing a pulsating subdwarf B (sdB) star. The main part of the campaign (1999 April) resulted in ∼172 h of observations, representing a coverage of about 47 per cent, and additional data were obtained outside the core campaign. Periodogram analysis shows that the light variations are dominated by three frequencies near 5757, 5585 and 5369 μHz (∼174, 179 and 186 s, respectively), although many frequencies are present, particularly in the range 5000–6000 μHz (∼200–170 s). We identify, with some confidence, 28 frequencies down to a semi‐amplitude of 0.0005 in fractional intensity (equivalent to about 0.5 mmag). It is clear that the pulsation frequencies of PG 1336−018 have changed substantially since the 1996 discovery observations were made, and that amplitude changes occur, at least in the dominant three frequencies, on relatively short time‐scales (of the order of a day). On the assumption that the pulsating star is phase‐locked in the binary system, we have searched for rotational splitting of frequencies near the orbital and half of the orbital period, but the results are confused by aliasing at those frequencies (due to the data gaps caused by the eclipses). A preliminary model qualitatively matches the distribution of frequencies in PG 1336−018, with some good individual correspondences, but cannot be considered adequate because geometric cancellation should hide some of the modes which are apparently detected. Analysis of the pulsations during eclipse recovers three of the strongest modes, but the limited eclipse data – which can, at best, be only about 9 per cent of the total – do not allow mode identification at this stage. Simulations indicate that an overall coverage of about 80 per cent would be required for this to be viable. An attempt was made to determine phase shifts in the pulsation frequencies as a way of directly measuring the size of the binary orbit, but the uncertainties in the method are comparable to the light travel time across the orbit (probably less than a second).</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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