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Amplitude and frequency variability of the pulsating DB white dwarf stars KUV 05134+2605 and PG 1654+160 observed with the Whole Earth Telescope

Identifieur interne : 00AF61 ( Main/Exploration ); précédent : 00AF60; suivant : 00AF62

Amplitude and frequency variability of the pulsating DB white dwarf stars KUV 05134+2605 and PG 1654+160 observed with the Whole Earth Telescope

Auteurs : G. Handler [Afrique du Sud, Autriche] ; D. O'Donoghue [Afrique du Sud] ; M. Müller [Afrique du Sud] ; J. Solheim [Norvège] ; J. M. Gonzalez-Perez [Norvège] ; F. Johannessen [Norvège] ; M. Paparo [Hongrie] ; B. Szeidl [Hongrie] ; G. Viraghalmy [Hongrie] ; R. Silvotti [Italie] ; G. Vauclair [France] ; N. Dolez [France] ; E. Pallier [France] ; M. Chevreton [France] ; D. W. Kurtz [France] ; G. E. Bromage ; M. S. Cunha [Portugal] ; R. Stensen [Espagne] ; L. Fraga ; A. Kanaan ; A. Amorim ; O. Giovannini ; S. O. Kepler [Brésil] ; A. F. M. Da Costa [Brésil] ; R. F. Anderson [États-Unis] ; M. A. Wood [États-Unis] ; N. Silvestri [États-Unis] ; E. W. Klumpe [États-Unis] ; R. F. Carlton [États-Unis] ; R. H. Miller [États-Unis] ; J. P. Mcfarland [États-Unis] ; A. D. Grauer [États-Unis] ; S. D. Kawaler [États-Unis] ; R. L. Riddle [États-Unis] ; M. D. Reed [États-Unis] ; R. E. Nather [États-Unis] ; D. E. Winget [États-Unis] ; J. A. Hill [États-Unis] ; T. S. Metcalfe [États-Unis] ; A. S. Mukadam [États-Unis] ; M. Kilic [États-Unis] ; T. K. Watson [États-Unis] ; S. J. Kleinman [États-Unis] ; A. Nitta [États-Unis] ; J. A. Guzik [États-Unis] ; P. A. Bradley [États-Unis] ; K. Sekiguchi [États-Unis] ; D. J. Sullivan [Nouvelle-Zélande] ; T. Sullivan [Nouvelle-Zélande] ; R. R. Shobbrook [Australie] ; X. Jiang [République populaire de Chine] ; P. V. Birch [Australie] ; B. N. Ashoka [Inde] ; S. Seetha [Inde] ; V. Girish [Inde] ; S. Joshi [Inde] ; T. N. Dorokhova [Ukraine] ; N. I. Dorokhov [Ukraine] ; M. C. Akan [Turquie] ; E. G. Meištas [Lituanie] ; R. Janulis [Lituanie] ; R. Kalytis [Lituanie] ; D. Ališauskas [Lituanie] ; S. K. Anguma [Ouganda] ; P. C. Kalebwe [Zambie] ; P. Moskalik [Pologne] ; W. Ogloza [Pologne] ; G. Stachowski [Pologne] ; G. Pajdosz [Pologne] ; S. Zola [Pologne]

Source :

RBID : ISTEX:36DD78AEA58C1D5C2D35B8CDABA658B4949A057A

English descriptors

Abstract

We have acquired new time series photometry of the two pulsating DB white dwarf stars KUV 05134+2605 and PG 1654+160 with the Whole Earth Telescope. Additional single‐site photometry is also presented. We use all these data plus all available archival measurements to study the temporal behaviour of the pulsational amplitudes and frequencies of these stars for the first time. We demonstrate that both KUV 05134+2605 and PG 1654+160 pulsate in many modes, the amplitudes of which are variable in time; some frequency variability of PG 1654+160 is also indicated. Beating of multiple pulsation modes cannot explain our observations; the amplitude variability must therefore be intrinsic. We cannot find stable modes to be used for determinations of the evolutionary period changes of the stars. Some of the modes of PG 1654+160 appear at the same periods whenever detected. The mean spacing of these periods (≈40 s) suggests that they are probably caused by non‐radial gravity‐mode pulsations of spherical degree ℓ= 1. If so, PG 1654+160 has a mass around 0.6 M⊙. The time‐scales of the amplitude variability of both stars (down to two weeks) are consistent with theoretical predictions of resonant mode coupling, a conclusion which might however be affected by the temporal distribution of our data.

Url:
DOI: 10.1046/j.1365-8711.2003.06373.x


Affiliations:


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Le document en format XML

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<wicri:noRegion>I‐80131 Napoli</wicri:noRegion>
</affiliation>
</author>
<author>
<name sortKey="Vauclair, G" sort="Vauclair, G" uniqKey="Vauclair G" first="G." last="Vauclair">G. Vauclair</name>
<affiliation wicri:level="3">
<country xml:lang="fr">France</country>
<wicri:regionArea>Observatoire Midi‐Pyrénées, CNRS/UMR5572, 14 av. E. Belin, 31400 Toulouse</wicri:regionArea>
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<region type="region" nuts="2">Occitanie (région administrative)</region>
<region type="old region" nuts="2">Midi-Pyrénées</region>
<settlement type="city">Toulouse</settlement>
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</affiliation>
</author>
<author>
<name sortKey="Dolez, N" sort="Dolez, N" uniqKey="Dolez N" first="N." last="Dolez">N. Dolez</name>
<affiliation wicri:level="1">
<country xml:lang="fr">France</country>
<wicri:regionArea>Observatoire Midi‐Pyrénées, CNRS/UMR5572, 14 av. E. Belin, 31400 Toulouse</wicri:regionArea>
<placeName>
<settlement type="city">Toulouse</settlement>
<region type="region" nuts="2">Occitanie (région administrative)</region>
<region type="old region" nuts="2">Midi-Pyrénées</region>
</placeName>
</affiliation>
</author>
<author>
<name sortKey="Pallier, E" sort="Pallier, E" uniqKey="Pallier E" first="E." last="Pallier">E. Pallier</name>
<affiliation wicri:level="1">
<country xml:lang="fr">France</country>
<wicri:regionArea>Observatoire Midi‐Pyrénées, CNRS/UMR5572, 14 av. E. Belin, 31400 Toulouse</wicri:regionArea>
<placeName>
<settlement type="city">Toulouse</settlement>
<region type="region" nuts="2">Occitanie (région administrative)</region>
<region type="old region" nuts="2">Midi-Pyrénées</region>
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</affiliation>
</author>
<author>
<name sortKey="Chevreton, M" sort="Chevreton, M" uniqKey="Chevreton M" first="M." last="Chevreton">M. Chevreton</name>
<affiliation wicri:level="1">
<country xml:lang="fr">France</country>
<wicri:regionArea>Observatoire de Paris‐Meudon, LESIA, 92195 Meudon</wicri:regionArea>
<wicri:noRegion>92195 Meudon</wicri:noRegion>
<wicri:noRegion>92195 Meudon</wicri:noRegion>
</affiliation>
</author>
<author>
<name sortKey="Kurtz, D W" sort="Kurtz, D W" uniqKey="Kurtz D" first="D. W." last="Kurtz">D. W. Kurtz</name>
<affiliation wicri:level="3">
<country xml:lang="fr">France</country>
<wicri:regionArea>Observatoire Midi‐Pyrénées, CNRS/UMR5572, 14 av. E. Belin, 31400 Toulouse</wicri:regionArea>
<placeName>
<region type="region" nuts="2">Occitanie (région administrative)</region>
<region type="old region" nuts="2">Midi-Pyrénées</region>
<settlement type="city">Toulouse</settlement>
</placeName>
</affiliation>
<affiliation></affiliation>
</author>
<author>
<name sortKey="Bromage, G E" sort="Bromage, G E" uniqKey="Bromage G" first="G. E." last="Bromage">G. E. Bromage</name>
<affiliation>
<wicri:noCountry code="subField">2HE</wicri:noCountry>
</affiliation>
</author>
<author>
<name sortKey="Cunha, M S" sort="Cunha, M S" uniqKey="Cunha M" first="M. S." last="Cunha">M. S. Cunha</name>
<affiliation wicri:level="1">
<country xml:lang="fr">Portugal</country>
<wicri:regionArea>Centro de Astrofísica da Universidade do Porto, Rua das Estrelas, 4150‐762 Porto</wicri:regionArea>
<wicri:noRegion>4150‐762 Porto</wicri:noRegion>
</affiliation>
<affiliation wicri:level="1">
<country xml:lang="fr">Portugal</country>
<wicri:regionArea>Instituto Superior da Maia, Lugar de Vilarinho, 4470 Castelo da Maia</wicri:regionArea>
<wicri:noRegion>4470 Castelo da Maia</wicri:noRegion>
</affiliation>
</author>
<author>
<name sortKey=" Stensen, R" sort=" Stensen, R" uniqKey=" Stensen R" first="R." last=" Stensen">R. Stensen</name>
<affiliation wicri:level="1">
<country xml:lang="fr">Espagne</country>
<wicri:regionArea>Isaac Newton Group of Telescopes, 37800 Santa Cruz de La Palma, Canary Islands</wicri:regionArea>
<wicri:noRegion>Canary Islands</wicri:noRegion>
</affiliation>
</author>
<author>
<name sortKey="Fraga, L" sort="Fraga, L" uniqKey="Fraga L" first="L." last="Fraga">L. Fraga</name>
<affiliation>
<wicri:noCountry code="subField">SC‐Brazil</wicri:noCountry>
</affiliation>
</author>
<author>
<name sortKey="Kanaan, A" sort="Kanaan, A" uniqKey="Kanaan A" first="A." last="Kanaan">A. Kanaan</name>
<affiliation>
<wicri:noCountry code="subField">SC‐Brazil</wicri:noCountry>
</affiliation>
</author>
<author>
<name sortKey="Amorim, A" sort="Amorim, A" uniqKey="Amorim A" first="A." last="Amorim">A. Amorim</name>
<affiliation>
<wicri:noCountry code="subField">SC‐Brazil</wicri:noCountry>
</affiliation>
</author>
<author>
<name sortKey="Giovannini, O" sort="Giovannini, O" uniqKey="Giovannini O" first="O." last="Giovannini">O. Giovannini</name>
<affiliation>
<wicri:noCountry code="subField">RS‐Brazil</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="2">
<country xml:lang="fr">Brésil</country>
<wicri:regionArea>Instituto de Física, UFRGS, Campus do Vale, C.P. 15051 Porto Alegre, RS</wicri:regionArea>
<placeName>
<region type="state">Rio Grande do Sul</region>
</placeName>
</affiliation>
</author>
<author>
<name sortKey="Da Costa, A F M" sort="Da Costa, A F M" uniqKey="Da Costa A" first="A. F. M." last="Da Costa">A. F. M. Da Costa</name>
<affiliation wicri:level="2">
<country xml:lang="fr">Brésil</country>
<wicri:regionArea>Instituto de Física, UFRGS, Campus do Vale, C.P. 15051 Porto Alegre, RS</wicri:regionArea>
<placeName>
<region type="state">Rio Grande do Sul</region>
</placeName>
</affiliation>
</author>
<author>
<name sortKey="Anderson, R F" sort="Anderson, R F" uniqKey="Anderson R" first="R. F." last="Anderson">R. F. Anderson</name>
<affiliation wicri:level="2">
<country xml:lang="fr">États-Unis</country>
<wicri:regionArea>Department of Physics and Astronomy, University of North Carolina, Chapel Hill, NC 27599‐3255</wicri:regionArea>
<placeName>
<region type="state">Caroline du Nord</region>
</placeName>
</affiliation>
</author>
<author>
<name sortKey="Wood, M A" sort="Wood, M A" uniqKey="Wood M" first="M. A." last="Wood">M. A. Wood</name>
<affiliation wicri:level="2">
<country xml:lang="fr">États-Unis</country>
<wicri:regionArea>Department of Physics & Space Sciences and SARA Observatory, Florida Institute of Technology, Melbourne, FL 32901</wicri:regionArea>
<placeName>
<region type="state">Floride</region>
</placeName>
</affiliation>
</author>
<author>
<name sortKey="Silvestri, N" sort="Silvestri, N" uniqKey="Silvestri N" first="N." last="Silvestri">N. Silvestri</name>
<affiliation wicri:level="2">
<country xml:lang="fr">États-Unis</country>
<wicri:regionArea>Department of Physics & Space Sciences and SARA Observatory, Florida Institute of Technology, Melbourne, FL 32901</wicri:regionArea>
<placeName>
<region type="state">Floride</region>
</placeName>
</affiliation>
</author>
<author>
<name sortKey="Klumpe, E W" sort="Klumpe, E W" uniqKey="Klumpe E" first="E. W." last="Klumpe">E. W. Klumpe</name>
<affiliation wicri:level="2">
<country xml:lang="fr">États-Unis</country>
<wicri:regionArea>Department of Physics and Astronomy, Middle Tennessee State University, Murfreesboro, TN 37132</wicri:regionArea>
<placeName>
<region type="state">Tennessee</region>
</placeName>
</affiliation>
</author>
<author>
<name sortKey="Carlton, R F" sort="Carlton, R F" uniqKey="Carlton R" first="R. F." last="Carlton">R. F. Carlton</name>
<affiliation wicri:level="2">
<country xml:lang="fr">États-Unis</country>
<wicri:regionArea>Department of Physics and Astronomy, Middle Tennessee State University, Murfreesboro, TN 37132</wicri:regionArea>
<placeName>
<region type="state">Tennessee</region>
</placeName>
</affiliation>
</author>
<author>
<name sortKey="Miller, R H" sort="Miller, R H" uniqKey="Miller R" first="R. H." last="Miller">R. H. Miller</name>
<affiliation wicri:level="2">
<country xml:lang="fr">États-Unis</country>
<wicri:regionArea>Department of Physics and Astronomy, Georgia State University, Atlanta, GA 30303</wicri:regionArea>
<placeName>
<region type="state">Géorgie (États-Unis)</region>
</placeName>
</affiliation>
</author>
<author>
<name sortKey="Mcfarland, J P" sort="Mcfarland, J P" uniqKey="Mcfarland J" first="J. P." last="Mcfarland">J. P. Mcfarland</name>
<affiliation wicri:level="2">
<country xml:lang="fr">États-Unis</country>
<wicri:regionArea>Department of Physics and Astronomy, Georgia State University, Atlanta, GA 30303</wicri:regionArea>
<placeName>
<region type="state">Géorgie (États-Unis)</region>
</placeName>
</affiliation>
</author>
<author>
<name sortKey="Grauer, A D" sort="Grauer, A D" uniqKey="Grauer A" first="A. D." last="Grauer">A. D. Grauer</name>
<affiliation wicri:level="2">
<country xml:lang="fr">États-Unis</country>
<wicri:regionArea>Department of Physics and Astronomy, University of Arkansas at Little Rock, Little Rock, AR 72204</wicri:regionArea>
<placeName>
<region type="state">Arkansas</region>
</placeName>
</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="4">
<country xml:lang="fr">États-Unis</country>
<wicri:regionArea>Department of Physics and Astronomy, Iowa State University, Ames, IA 50011</wicri:regionArea>
<placeName>
<region type="state">Iowa</region>
<settlement type="city">Ames (Iowa)</settlement>
</placeName>
<orgName type="university">Université d'État de l'Iowa</orgName>
</affiliation>
</author>
<author>
<name sortKey="Riddle, R L" sort="Riddle, R L" uniqKey="Riddle R" first="R. L." last="Riddle">R. L. Riddle</name>
<affiliation wicri:level="4">
<country xml:lang="fr">États-Unis</country>
<wicri:regionArea>Department of Physics and Astronomy, Iowa State University, Ames, IA 50011</wicri:regionArea>
<placeName>
<region type="state">Iowa</region>
<settlement type="city">Ames (Iowa)</settlement>
</placeName>
<orgName type="university">Université d'État de l'Iowa</orgName>
</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">
<country xml:lang="fr">États-Unis</country>
<wicri:regionArea>Department of Physics, Astronomy and Material Science, SW Missouri State University, 901 S. National, Springfield</wicri:regionArea>
<wicri:noRegion>Springfield</wicri:noRegion>
</affiliation>
</author>
<author>
<name sortKey="Nather, R E" sort="Nather, R E" uniqKey="Nather R" first="R. E." last="Nather">R. E. Nather</name>
<affiliation wicri:level="4">
<country xml:lang="fr">États-Unis</country>
<wicri:regionArea>Department of Astronomy and McDonald Observatory, University of Texas at Austin, Austin, TX 78712</wicri:regionArea>
<placeName>
<region type="state">Texas</region>
<settlement type="city">Austin (Texas)</settlement>
</placeName>
<orgName type="university">Université du Texas à Austin</orgName>
</affiliation>
</author>
<author>
<name sortKey="Winget, D E" sort="Winget, D E" uniqKey="Winget D" first="D. E." last="Winget">D. E. Winget</name>
<affiliation wicri:level="4">
<country xml:lang="fr">États-Unis</country>
<wicri:regionArea>Department of Astronomy and McDonald Observatory, University of Texas at Austin, Austin, TX 78712</wicri:regionArea>
<placeName>
<region type="state">Texas</region>
<settlement type="city">Austin (Texas)</settlement>
</placeName>
<orgName type="university">Université du Texas à Austin</orgName>
</affiliation>
</author>
<author>
<name sortKey="Hill, J A" sort="Hill, J A" uniqKey="Hill J" first="J. A." last="Hill">J. A. Hill</name>
<affiliation wicri:level="4">
<country xml:lang="fr">États-Unis</country>
<wicri:regionArea>Department of Astronomy and McDonald Observatory, University of Texas at Austin, Austin, TX 78712</wicri:regionArea>
<placeName>
<region type="state">Texas</region>
<settlement type="city">Austin (Texas)</settlement>
</placeName>
<orgName type="university">Université du Texas à Austin</orgName>
</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="4">
<country xml:lang="fr">États-Unis</country>
<wicri:regionArea>Department of Astronomy and McDonald Observatory, University of Texas at Austin, Austin, TX 78712</wicri:regionArea>
<placeName>
<region type="state">Texas</region>
<settlement type="city">Austin (Texas)</settlement>
</placeName>
<orgName type="university">Université du Texas à Austin</orgName>
</affiliation>
<affiliation wicri:level="2">
<country xml:lang="fr">États-Unis</country>
<wicri:regionArea>Harvard‐Smithsonian Centre for Astrophysics, 60 Garden Street, Cambridge, MA 02138</wicri:regionArea>
<placeName>
<region type="state">Massachusetts</region>
</placeName>
</affiliation>
</author>
<author>
<name sortKey="Mukadam, A S" sort="Mukadam, A S" uniqKey="Mukadam A" first="A. S." last="Mukadam">A. S. Mukadam</name>
<affiliation wicri:level="4">
<country xml:lang="fr">États-Unis</country>
<wicri:regionArea>Department of Astronomy and McDonald Observatory, University of Texas at Austin, Austin, TX 78712</wicri:regionArea>
<placeName>
<region type="state">Texas</region>
<settlement type="city">Austin (Texas)</settlement>
</placeName>
<orgName type="university">Université du Texas à Austin</orgName>
</affiliation>
</author>
<author>
<name sortKey="Kilic, M" sort="Kilic, M" uniqKey="Kilic M" first="M." last="Kilic">M. Kilic</name>
<affiliation wicri:level="4">
<country xml:lang="fr">États-Unis</country>
<wicri:regionArea>Department of Astronomy and McDonald Observatory, University of Texas at Austin, Austin, TX 78712</wicri:regionArea>
<placeName>
<region type="state">Texas</region>
<settlement type="city">Austin (Texas)</settlement>
</placeName>
<orgName type="university">Université du Texas à Austin</orgName>
</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="2">
<country xml:lang="fr">États-Unis</country>
<wicri:regionArea>Information Technology Services Department, Southwestern University, Georgetown, TX 78626</wicri:regionArea>
<placeName>
<region type="state">Texas</region>
</placeName>
</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="2">
<country xml:lang="fr">États-Unis</country>
<wicri:regionArea>Sloan Digital Sky Survey, Apache Pt. Observatory, PO Box 59, Sunspot, NM 88349</wicri:regionArea>
<placeName>
<region type="state">Nouveau-Mexique</region>
</placeName>
</affiliation>
</author>
<author>
<name sortKey="Nitta, A" sort="Nitta, A" uniqKey="Nitta A" first="A." last="Nitta">A. Nitta</name>
<affiliation wicri:level="2">
<country xml:lang="fr">États-Unis</country>
<wicri:regionArea>Sloan Digital Sky Survey, Apache Pt. Observatory, PO Box 59, Sunspot, NM 88349</wicri:regionArea>
<placeName>
<region type="state">Nouveau-Mexique</region>
</placeName>
</affiliation>
</author>
<author>
<name sortKey="Guzik, J A" sort="Guzik, J A" uniqKey="Guzik J" first="J. A." last="Guzik">J. A. Guzik</name>
<affiliation wicri:level="2">
<country xml:lang="fr">États-Unis</country>
<wicri:regionArea>Los Alamos National Laboratory, X‐2, MS T‐085, Los Alamos, NM 87545‐2345</wicri:regionArea>
<placeName>
<region type="state">Nouveau-Mexique</region>
</placeName>
</affiliation>
</author>
<author>
<name sortKey="Bradley, P A" sort="Bradley, P A" uniqKey="Bradley P" first="P. A." last="Bradley">P. A. Bradley</name>
<affiliation wicri:level="2">
<country xml:lang="fr">États-Unis</country>
<wicri:regionArea>Los Alamos National Laboratory, X‐2, MS T‐085, Los Alamos, NM 87545‐2345</wicri:regionArea>
<placeName>
<region type="state">Nouveau-Mexique</region>
</placeName>
</affiliation>
</author>
<author>
<name sortKey="Sekiguchi, K" sort="Sekiguchi, K" uniqKey="Sekiguchi K" first="K." last="Sekiguchi">K. Sekiguchi</name>
<affiliation wicri:level="2">
<country xml:lang="fr">États-Unis</country>
<wicri:regionArea>Subaru Telescope, National Astronomical Observatory of Japan, 650 North A‘ohōkū Place, Hilo, HI 96720</wicri:regionArea>
<placeName>
<region type="state">Hawaï</region>
</placeName>
</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">
<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>
<wicri:noRegion>Wellington</wicri:noRegion>
</affiliation>
</author>
<author>
<name sortKey="Sullivan, T" sort="Sullivan, T" uniqKey="Sullivan T" first="T." last="Sullivan">T. Sullivan</name>
<affiliation wicri:level="1">
<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>
<wicri:noRegion>Wellington</wicri:noRegion>
</affiliation>
</author>
<author>
<name sortKey="Shobbrook, R R" sort="Shobbrook, R R" uniqKey="Shobbrook R" first="R. R." last="Shobbrook">R. R. Shobbrook</name>
<affiliation wicri:level="1">
<country xml:lang="fr">Australie</country>
<wicri:regionArea>PO Box 518, Coonabarabran, NSW 2357</wicri:regionArea>
<wicri:noRegion>NSW 2357</wicri:noRegion>
</affiliation>
<affiliation wicri:level="1">
<country xml:lang="fr">Australie</country>
<wicri:regionArea>Research School of Astronomy and Astrophysics, Australian National University, Weston Creek PO, ACT 2611</wicri:regionArea>
<wicri:noRegion>ACT 2611</wicri:noRegion>
</affiliation>
</author>
<author>
<name sortKey="Jiang, X" sort="Jiang, X" uniqKey="Jiang X" first="X." last="Jiang">X. Jiang</name>
<affiliation wicri:level="1">
<country xml:lang="fr">République populaire de Chine</country>
<wicri:regionArea>National Astronomical Observatories and Joint Laboratory of Optical Astronomy, Chinese Academy of Sciences, Beijing 100012</wicri:regionArea>
<placeName>
<settlement type="city">Pékin</settlement>
</placeName>
</affiliation>
</author>
<author>
<name sortKey="Birch, P V" sort="Birch, P V" uniqKey="Birch P" first="P. V." last="Birch">P. V. Birch</name>
<affiliation wicri:level="1">
<country xml:lang="fr">Australie</country>
<wicri:regionArea>Perth Observatory, Walnut Rd, Bickley, Western Australia 6076</wicri:regionArea>
<wicri:noRegion>Western Australia 6076</wicri:noRegion>
</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">
<country xml:lang="fr">Inde</country>
<wicri:regionArea>Indian Space Research Organization, Vimanapura PO, Bangalore 560 017</wicri:regionArea>
<wicri:noRegion>Bangalore 560 017</wicri:noRegion>
</affiliation>
</author>
<author>
<name sortKey="Seetha, S" sort="Seetha, S" uniqKey="Seetha S" first="S." last="Seetha">S. Seetha</name>
<affiliation wicri:level="1">
<country xml:lang="fr">Inde</country>
<wicri:regionArea>Indian Space Research Organization, Vimanapura PO, Bangalore 560 017</wicri:regionArea>
<wicri:noRegion>Bangalore 560 017</wicri:noRegion>
</affiliation>
</author>
<author>
<name sortKey="Girish, V" sort="Girish, V" uniqKey="Girish V" first="V." last="Girish">V. Girish</name>
<affiliation wicri:level="1">
<country xml:lang="fr">Inde</country>
<wicri:regionArea>Indian Space Research Organization, Vimanapura PO, Bangalore 560 017</wicri:regionArea>
<wicri:noRegion>Bangalore 560 017</wicri:noRegion>
</affiliation>
</author>
<author>
<name sortKey="Joshi, S" sort="Joshi, S" uniqKey="Joshi S" first="S." last="Joshi">S. Joshi</name>
<affiliation wicri:level="1">
<country xml:lang="fr">Inde</country>
<wicri:regionArea>State Observatory, Manora Peak, Naini Tal 263 129</wicri:regionArea>
<wicri:noRegion>Naini Tal 263 129</wicri:noRegion>
</affiliation>
</author>
<author>
<name sortKey="Dorokhova, T N" sort="Dorokhova, T N" uniqKey="Dorokhova T" first="T. N." last="Dorokhova">T. N. Dorokhova</name>
<affiliation wicri:level="1">
<country xml:lang="fr">Ukraine</country>
<wicri:regionArea>Astronomical Observatory, Odessa State University, Shevchenko Park, Odessa 270014</wicri:regionArea>
<wicri:noRegion>Odessa 270014</wicri:noRegion>
</affiliation>
</author>
<author>
<name sortKey="Dorokhov, N I" sort="Dorokhov, N I" uniqKey="Dorokhov N" first="N. I." last="Dorokhov">N. I. Dorokhov</name>
<affiliation wicri:level="1">
<country xml:lang="fr">Ukraine</country>
<wicri:regionArea>Astronomical Observatory, Odessa State University, Shevchenko Park, Odessa 270014</wicri:regionArea>
<wicri:noRegion>Odessa 270014</wicri:noRegion>
</affiliation>
</author>
<author>
<name sortKey="Akan, M C" sort="Akan, M C" uniqKey="Akan M" first="M. C." last="Akan">M. C. Akan</name>
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<name sortKey="Kalytis, R" sort="Kalytis, R" uniqKey="Kalytis R" first="R." last="Kalytis">R. Kalytis</name>
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<author>
<name sortKey="Alisauskas, D" sort="Alisauskas, D" uniqKey="Alisauskas D" first="D." last="Ališauskas">D. Ališauskas</name>
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<name sortKey="Kalebwe, P C" sort="Kalebwe, P C" uniqKey="Kalebwe P" first="P. C." last="Kalebwe">P. C. Kalebwe</name>
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<wicri:regionArea>Physics Department, The University of Zambia, PO Box 32379, Lusaka</wicri:regionArea>
<wicri:noRegion>Lusaka</wicri:noRegion>
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<wicri:regionArea>Mount Suhora Observatory, Krakow Pedagogical University, ul. Podchorǎz̄ych 2, 30‐084 Cracow</wicri:regionArea>
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<wicri:regionArea>Mount Suhora Observatory, Krakow Pedagogical University, ul. Podchorǎz̄ych 2, 30‐084 Cracow</wicri:regionArea>
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<affiliation wicri:level="1">
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<wicri:regionArea>Astronomical Observatory, Jagiellonian University, ul. Orla 171, 30‐244 Cracow</wicri:regionArea>
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<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">340</biblScope>
<biblScope unit="issue">3</biblScope>
<biblScope unit="page" from="1031">1031</biblScope>
<biblScope unit="page" to="1038">1038</biblScope>
<biblScope unit="page-count">8</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="2003-04">2003-04</date>
</imprint>
<idno type="ISSN">0035-8711</idno>
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<idno type="ISSN">0035-8711</idno>
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<keywords scheme="KwdEn" xml:lang="en">
<term>Alias ambiguities</term>
<term>Amplitude</term>
<term>Amplitude spectra</term>
<term>Amplitude spectrum</term>
<term>Amplitude variability</term>
<term>Amplitude variations</term>
<term>Astronomical observatory</term>
<term>Astronomy observatory</term>
<term>Available discovery data</term>
<term>Available measurements</term>
<term>Complete mode spectrum</term>
<term>Consecutive panels</term>
<term>Ctio</term>
<term>Data reduction</term>
<term>Data sets</term>
<term>Discovery light curve</term>
<term>Dominant signals</term>
<term>Dwarf</term>
<term>Error estimates</term>
<term>Frequency analyses</term>
<term>Frequency analysis</term>
<term>Frequency variability</term>
<term>Frequency variations</term>
<term>Goupil serre</term>
<term>Iowa state university</term>
<term>Light curves</term>
<term>Little rock</term>
<term>Lower panel</term>
<term>Mcdonald observatory</term>
<term>Mnras</term>
<term>More signals</term>
<term>Multiple pulsation modes</term>
<term>Multisite campaigns</term>
<term>Observatory</term>
<term>Other data sets</term>
<term>Photometric observations</term>
<term>Possible combination frequencies</term>
<term>Pulsation</term>
<term>Pulsation amplitudes</term>
<term>Pulsation frequencies</term>
<term>Pulsational</term>
<term>Radial overtones</term>
<term>Resonant mode</term>
<term>Saao</term>
<term>Same periods</term>
<term>Second part lists</term>
<term>Shorter periods</term>
<term>Spectral window</term>
<term>Spherical degree</term>
<term>Stable modes</term>
<term>Target star light curves</term>
<term>Temporal behaviour</term>
<term>Temporal coverage</term>
<term>Temporal distribution</term>
<term>Theoretical predictions</term>
<term>Upper panel</term>
<term>Variability</term>
<term>Variability periods</term>
<term>White dwarf</term>
<term>White dwarf stars</term>
<term>Whole earth telescope</term>
<term>Winget</term>
<term>stars: individual: KUV 05134+2605</term>
<term>stars: individual: PG 1654+160</term>
<term>stars: oscillations</term>
<term>stars: variables: other.</term>
</keywords>
<keywords scheme="Teeft" xml:lang="en">
<term>Alias ambiguities</term>
<term>Amplitude</term>
<term>Amplitude spectra</term>
<term>Amplitude spectrum</term>
<term>Amplitude variability</term>
<term>Amplitude variations</term>
<term>Astronomical observatory</term>
<term>Astronomy observatory</term>
<term>Available discovery data</term>
<term>Available measurements</term>
<term>Complete mode spectrum</term>
<term>Consecutive panels</term>
<term>Ctio</term>
<term>Data reduction</term>
<term>Data sets</term>
<term>Discovery light curve</term>
<term>Dominant signals</term>
<term>Dwarf</term>
<term>Error estimates</term>
<term>Frequency analyses</term>
<term>Frequency analysis</term>
<term>Frequency variability</term>
<term>Frequency variations</term>
<term>Goupil serre</term>
<term>Iowa state university</term>
<term>Light curves</term>
<term>Little rock</term>
<term>Lower panel</term>
<term>Mcdonald observatory</term>
<term>Mnras</term>
<term>More signals</term>
<term>Multiple pulsation modes</term>
<term>Multisite campaigns</term>
<term>Observatory</term>
<term>Other data sets</term>
<term>Photometric observations</term>
<term>Possible combination frequencies</term>
<term>Pulsation</term>
<term>Pulsation amplitudes</term>
<term>Pulsation frequencies</term>
<term>Pulsational</term>
<term>Radial overtones</term>
<term>Resonant mode</term>
<term>Saao</term>
<term>Same periods</term>
<term>Second part lists</term>
<term>Shorter periods</term>
<term>Spectral window</term>
<term>Spherical degree</term>
<term>Stable modes</term>
<term>Target star light curves</term>
<term>Temporal behaviour</term>
<term>Temporal coverage</term>
<term>Temporal distribution</term>
<term>Theoretical predictions</term>
<term>Upper panel</term>
<term>Variability</term>
<term>Variability periods</term>
<term>White dwarf</term>
<term>White dwarf stars</term>
<term>Whole earth telescope</term>
<term>Winget</term>
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<front>
<div type="abstract" xml:lang="en">We have acquired new time series photometry of the two pulsating DB white dwarf stars KUV 05134+2605 and PG 1654+160 with the Whole Earth Telescope. Additional single‐site photometry is also presented. We use all these data plus all available archival measurements to study the temporal behaviour of the pulsational amplitudes and frequencies of these stars for the first time. We demonstrate that both KUV 05134+2605 and PG 1654+160 pulsate in many modes, the amplitudes of which are variable in time; some frequency variability of PG 1654+160 is also indicated. Beating of multiple pulsation modes cannot explain our observations; the amplitude variability must therefore be intrinsic. We cannot find stable modes to be used for determinations of the evolutionary period changes of the stars. Some of the modes of PG 1654+160 appear at the same periods whenever detected. The mean spacing of these periods (≈40 s) suggests that they are probably caused by non‐radial gravity‐mode pulsations of spherical degree ℓ= 1. If so, PG 1654+160 has a mass around 0.6 M⊙. The time‐scales of the amplitude variability of both stars (down to two weeks) are consistent with theoretical predictions of resonant mode coupling, a conclusion which might however be affected by the temporal distribution of our data.</div>
</front>
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<li>Ouganda</li>
<li>Pologne</li>
<li>Portugal</li>
<li>République populaire de Chine</li>
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