Multisite campaign on the open cluster M67 – III. δ Scuti pulsations in the blue stragglers
Identifieur interne : 001423 ( Istex/Curation ); précédent : 001422; suivant : 001424Multisite campaign on the open cluster M67 – III. δ Scuti pulsations in the blue stragglers
Auteurs : H. Bruntt [Australie] ; D. Stello [Australie, Danemark, États-Unis] ; J. C. Suárez [Espagne, France] ; T. Arentoft [Danemark] ; T. R. Bedding [Australie] ; M. Y. Bouzid [Belgique] ; Z. Csubry [Hongrie] ; T. H. Dall [États-Unis, Chili] ; Z. E. Dind [Australie] ; S. Frandsen [Danemark] ; R. L. Gilliland [États-Unis] ; A. P. Jacob [Australie] ; H. R. Jensen [Danemark] ; Y. B. Kang [Corée du Sud] ; S.-L. Kim [Corée du Sud] ; L. L. Kiss [Australie] ; H. Kjeldsen [Danemark] ; J.-R. Koo [Corée du Sud] ; J.-A. Lee [Corée du Sud] ; C.-U. Lee [Corée du Sud] ; J. Nuspl [Hongrie] ; C. Sterken [Belgique] ; R. Szab [Hongrie, États-Unis]Source :
- Monthly Notices of the Royal Astronomical Society [ 0035-8711 ] ; 2007-07-11.
Abstract
We have made an asteroseismic analysis of the variable blue stragglers in the open cluster M67. The data set consists of photometric time-series from eight sites using nine 0.6–2.1 m telescopes with a time-baseline of 43 d. In two stars, EW Cnc and EX Cnc, we detect the highest number of frequencies (41 and 26) detected in δ Scuti stars belonging to a stellar cluster, and EW Cnc has the second highest number of frequencies detected in any δ Scuti star. We have computed a grid of pulsation models that take the effects of rotation into account. The distribution of observed and theoretical frequencies shows that in a wide frequency range a significant fraction of the radial and non-radial low-degree modes are excited to detectable amplitudes. Despite the large number of observed frequencies we cannot constrain the fundamental parameters of the stars. To make progress we need to identify the degrees of some of the modes from either multicolour photometry or spectroscopy.
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DOI: 10.1111/j.1365-2966.2007.11865.x
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H. Bruntt<affiliation><mods:affiliation></mods:affiliation><wicri:noCountry code="syntax">???</wicri:noCountry></affiliation><affiliation wicri:level="1"><mods:affiliation>E-mail: bruntt@physics.usyd.edu.au</mods:affiliation><country wicri:rule="url">Australie</country></affiliation>Le document en format XML
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Kjeldsen</name><affiliation wicri:level="1"><mods:affiliation>Institut for Fysik og Astronomi (IFA), University of Aarhus, DK-8000 Aarhus, Denmark</mods:affiliation><country xml:lang="fr">Danemark</country><wicri:regionArea>Institut for Fysik og Astronomi (IFA), University of Aarhus, DK-8000 Aarhus</wicri:regionArea></affiliation><affiliation wicri:level="1"><mods:affiliation>Danish AsteroSeismology Centre, University of Aarhus, DK-8000 Aarhus, Denmark</mods:affiliation><country xml:lang="fr">Danemark</country><wicri:regionArea>Danish AsteroSeismology Centre, University of Aarhus, DK-8000 Aarhus</wicri:regionArea></affiliation></author><author><name sortKey="Koo, J R" sort="Koo, J R" uniqKey="Koo J" first="J.-R." last="Koo">J.-R. Koo</name><affiliation wicri:level="1"><mods:affiliation>Department of Astronomy and Space Science, Chungnam National University, Daejeon 305-764, Korea</mods:affiliation><country xml:lang="fr">Corée du Sud</country><wicri:regionArea>Department of Astronomy and Space Science, Chungnam National University, Daejeon 305-764</wicri:regionArea></affiliation></author><author><name sortKey="Lee, J A" sort="Lee, J A" uniqKey="Lee J" first="J.-A." last="Lee">J.-A. Lee</name><affiliation wicri:level="1"><mods:affiliation>Korea Astronomy and Space Science Institute, Daejeon 305-348, Korea</mods:affiliation><country xml:lang="fr">Corée du Sud</country><wicri:regionArea>Korea Astronomy and Space Science Institute, Daejeon 305-348</wicri:regionArea></affiliation></author><author><name sortKey="Lee, C U" sort="Lee, C U" uniqKey="Lee C" first="C.-U." last="Lee">C.-U. 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Sterken</name><affiliation wicri:level="1"><mods:affiliation>Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels, Belgium</mods:affiliation><country xml:lang="fr">Belgique</country><wicri:regionArea>Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels</wicri:regionArea></affiliation></author><author><name sortKey="Szab, R" sort="Szab, R" uniqKey="Szab R" first="R." last="Szab">R. Szab</name><affiliation wicri:level="1"><mods:affiliation>Konkoly Observatory of the Hungarian Academy of Sciences, H-1525 Budapest, PO Box 67, Hungary</mods:affiliation><country xml:lang="fr">Hongrie</country><wicri:regionArea>Konkoly Observatory of the Hungarian Academy of Sciences, H-1525 Budapest, PO Box 67</wicri:regionArea></affiliation><affiliation wicri:level="1"><mods:affiliation>Physics Department, University of Florida, Gainesville, FL 32611, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Physics Department, University of Florida, Gainesville, FL 32611</wicri:regionArea></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:6C0F9E5242653A4EEC830E13AC9B1C085EFEC08E</idno><date when="2007" year="2007">2007</date><idno type="doi">10.1111/j.1365-2966.2007.11865.x</idno><idno type="url">https://api.istex.fr/document/6C0F9E5242653A4EEC830E13AC9B1C085EFEC08E/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">001423</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Corpus" wicri:corpus="ISTEX">001423</idno><idno type="wicri:Area/Istex/Curation">001423</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a">Multisite campaign on the open cluster M67 – III. δ Scuti pulsations in the blue stragglers</title><author><name sortKey="Bruntt, H" sort="Bruntt, H" uniqKey="Bruntt H" first="H." last="Bruntt">H. Bruntt</name><affiliation wicri:level="1"><mods:affiliation>School of Physics, University of Sydney, NSW 2006, Australia</mods:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>School of Physics, University of Sydney, NSW 2006</wicri:regionArea></affiliation><affiliation wicri:level="1"><mods:affiliation>E-mail: bruntt@physics.usyd.edu.au</mods:affiliation><country wicri:rule="url">Australie</country></affiliation><affiliation><mods:affiliation></mods:affiliation><wicri:noCountry code="syntax">???</wicri:noCountry></affiliation><affiliation wicri:level="1"><mods:affiliation>E-mail: bruntt@physics.usyd.edu.au</mods:affiliation><country wicri:rule="url">Australie</country></affiliation></author><author><name sortKey="Stello, D" sort="Stello, D" uniqKey="Stello D" first="D." last="Stello">D. Stello</name><affiliation wicri:level="1"><mods:affiliation>School of Physics, University of Sydney, NSW 2006, Australia</mods:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>School of Physics, University of Sydney, NSW 2006</wicri:regionArea></affiliation><affiliation wicri:level="1"><mods:affiliation>Institut for Fysik og Astronomi (IFA), University of Aarhus, DK-8000 Aarhus, Denmark</mods:affiliation><country xml:lang="fr">Danemark</country><wicri:regionArea>Institut for Fysik og Astronomi (IFA), University of Aarhus, DK-8000 Aarhus</wicri:regionArea></affiliation><affiliation wicri:level="1"><mods:affiliation>Department of Physics, US Air Force Academy, Colorado Springs, CO 80840, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Physics, US Air Force Academy, Colorado Springs, CO 80840</wicri:regionArea></affiliation></author><author><name sortKey="Suarez, J C" sort="Suarez, J C" uniqKey="Suarez J" first="J. C." last="Suárez">J. C. Suárez</name><affiliation wicri:level="1"><mods:affiliation>Instituto de Astrofísica de Andalucía, CSIC, CP3004 Granada, Spain</mods:affiliation><country xml:lang="fr">Espagne</country><wicri:regionArea>Instituto de Astrofísica de Andalucía, CSIC, CP3004 Granada</wicri:regionArea></affiliation><affiliation wicri:level="1"><mods:affiliation>Observatoire de Paris, LESIA, UMR 8109, Meudon, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>Observatoire de Paris, LESIA, UMR 8109, Meudon</wicri:regionArea></affiliation></author><author><name sortKey="Arentoft, T" sort="Arentoft, T" uniqKey="Arentoft T" first="T." last="Arentoft">T. Arentoft</name><affiliation wicri:level="1"><mods:affiliation>Institut for Fysik og Astronomi (IFA), University of Aarhus, DK-8000 Aarhus, Denmark</mods:affiliation><country xml:lang="fr">Danemark</country><wicri:regionArea>Institut for Fysik og Astronomi (IFA), University of Aarhus, DK-8000 Aarhus</wicri:regionArea></affiliation><affiliation wicri:level="1"><mods:affiliation>Danish AsteroSeismology Centre, University of Aarhus, DK-8000 Aarhus, Denmark</mods:affiliation><country xml:lang="fr">Danemark</country><wicri:regionArea>Danish AsteroSeismology Centre, University of Aarhus, DK-8000 Aarhus</wicri:regionArea></affiliation></author><author><name sortKey="Bedding, T R" sort="Bedding, T R" uniqKey="Bedding T" first="T. R." last="Bedding">T. R. Bedding</name><affiliation wicri:level="1"><mods:affiliation>School of Physics, University of Sydney, NSW 2006, Australia</mods:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>School of Physics, University of Sydney, NSW 2006</wicri:regionArea></affiliation></author><author><name sortKey="Bouzid, M Y" sort="Bouzid, M Y" uniqKey="Bouzid M" first="M. Y." last="Bouzid">M. Y. Bouzid</name><affiliation wicri:level="1"><mods:affiliation>Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels, Belgium</mods:affiliation><country xml:lang="fr">Belgique</country><wicri:regionArea>Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels</wicri:regionArea></affiliation></author><author><name sortKey="Csubry, Z" sort="Csubry, Z" uniqKey="Csubry Z" first="Z." last="Csubry">Z. Csubry</name><affiliation wicri:level="1"><mods:affiliation>Konkoly Observatory of the Hungarian Academy of Sciences, H-1525 Budapest, PO Box 67, Hungary</mods:affiliation><country xml:lang="fr">Hongrie</country><wicri:regionArea>Konkoly Observatory of the Hungarian Academy of Sciences, H-1525 Budapest, PO Box 67</wicri:regionArea></affiliation></author><author><name sortKey="Dall, T H" sort="Dall, T H" uniqKey="Dall T" first="T. H." last="Dall">T. H. Dall</name><affiliation wicri:level="1"><mods:affiliation>Gemini Observatory, 670 N. A'ohoku Pl., Hilo, HI 96720, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Gemini Observatory, 670 N. A'ohoku Pl., Hilo, HI 96720</wicri:regionArea></affiliation><affiliation wicri:level="1"><mods:affiliation>European Southern Observatory, Casilla 19001, Santiago 19, Chile</mods:affiliation><country xml:lang="fr">Chili</country><wicri:regionArea>European Southern Observatory, Casilla 19001, Santiago 19</wicri:regionArea></affiliation></author><author><name sortKey="Dind, Z E" sort="Dind, Z E" uniqKey="Dind Z" first="Z. E." last="Dind">Z. E. Dind</name><affiliation wicri:level="1"><mods:affiliation>School of Physics, University of Sydney, NSW 2006, Australia</mods:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>School of Physics, University of Sydney, NSW 2006</wicri:regionArea></affiliation></author><author><name sortKey="Frandsen, S" sort="Frandsen, S" uniqKey="Frandsen S" first="S." last="Frandsen">S. Frandsen</name><affiliation wicri:level="1"><mods:affiliation>Institut for Fysik og Astronomi (IFA), University of Aarhus, DK-8000 Aarhus, Denmark</mods:affiliation><country xml:lang="fr">Danemark</country><wicri:regionArea>Institut for Fysik og Astronomi (IFA), University of Aarhus, DK-8000 Aarhus</wicri:regionArea></affiliation><affiliation wicri:level="1"><mods:affiliation>Danish AsteroSeismology Centre, University of Aarhus, DK-8000 Aarhus, Denmark</mods:affiliation><country xml:lang="fr">Danemark</country><wicri:regionArea>Danish AsteroSeismology Centre, University of Aarhus, DK-8000 Aarhus</wicri:regionArea></affiliation></author><author><name sortKey="Gilliland, R L" sort="Gilliland, R L" uniqKey="Gilliland R" first="R. L." last="Gilliland">R. L. Gilliland</name><affiliation wicri:level="1"><mods:affiliation>Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Space Telescope Science Institute, 3700 San Martin Drive, Baltimore</wicri:regionArea></affiliation></author><author><name sortKey="Jacob, A P" sort="Jacob, A P" uniqKey="Jacob A" first="A. P." last="Jacob">A. P. Jacob</name><affiliation wicri:level="1"><mods:affiliation>School of Physics, University of Sydney, NSW 2006, Australia</mods:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>School of Physics, University of Sydney, NSW 2006</wicri:regionArea></affiliation></author><author><name sortKey="Jensen, H R" sort="Jensen, H R" uniqKey="Jensen H" first="H. R." last="Jensen">H. R. Jensen</name><affiliation wicri:level="1"><mods:affiliation>Institut for Fysik og Astronomi (IFA), University of Aarhus, DK-8000 Aarhus, Denmark</mods:affiliation><country xml:lang="fr">Danemark</country><wicri:regionArea>Institut for Fysik og Astronomi (IFA), University of Aarhus, DK-8000 Aarhus</wicri:regionArea></affiliation></author><author><name sortKey="Kang, Y B" sort="Kang, Y B" uniqKey="Kang Y" first="Y. B." last="Kang">Y. B. Kang</name><affiliation wicri:level="1"><mods:affiliation>Department of Astronomy and Space Science, Chungnam National University, Daejeon 305-764, Korea</mods:affiliation><country xml:lang="fr">Corée du Sud</country><wicri:regionArea>Department of Astronomy and Space Science, Chungnam National University, Daejeon 305-764</wicri:regionArea></affiliation></author><author><name sortKey="Kim, S L" sort="Kim, S L" uniqKey="Kim S" first="S.-L." last="Kim">S.-L. Kim</name><affiliation wicri:level="1"><mods:affiliation>Korea Astronomy and Space Science Institute, Daejeon 305-348, Korea</mods:affiliation><country xml:lang="fr">Corée du Sud</country><wicri:regionArea>Korea Astronomy and Space Science Institute, Daejeon 305-348</wicri:regionArea></affiliation></author><author><name sortKey="Kiss, L L" sort="Kiss, L L" uniqKey="Kiss L" first="L. L." last="Kiss">L. L. Kiss</name><affiliation wicri:level="1"><mods:affiliation>School of Physics, University of Sydney, NSW 2006, Australia</mods:affiliation><country xml:lang="fr">Australie</country><wicri:regionArea>School of Physics, University of Sydney, NSW 2006</wicri:regionArea></affiliation></author><author><name sortKey="Kjeldsen, H" sort="Kjeldsen, H" uniqKey="Kjeldsen H" first="H." last="Kjeldsen">H. Kjeldsen</name><affiliation wicri:level="1"><mods:affiliation>Institut for Fysik og Astronomi (IFA), University of Aarhus, DK-8000 Aarhus, Denmark</mods:affiliation><country xml:lang="fr">Danemark</country><wicri:regionArea>Institut for Fysik og Astronomi (IFA), University of Aarhus, DK-8000 Aarhus</wicri:regionArea></affiliation><affiliation wicri:level="1"><mods:affiliation>Danish AsteroSeismology Centre, University of Aarhus, DK-8000 Aarhus, Denmark</mods:affiliation><country xml:lang="fr">Danemark</country><wicri:regionArea>Danish AsteroSeismology Centre, University of Aarhus, DK-8000 Aarhus</wicri:regionArea></affiliation></author><author><name sortKey="Koo, J R" sort="Koo, J R" uniqKey="Koo J" first="J.-R." last="Koo">J.-R. Koo</name><affiliation wicri:level="1"><mods:affiliation>Department of Astronomy and Space Science, Chungnam National University, Daejeon 305-764, Korea</mods:affiliation><country xml:lang="fr">Corée du Sud</country><wicri:regionArea>Department of Astronomy and Space Science, Chungnam National University, Daejeon 305-764</wicri:regionArea></affiliation></author><author><name sortKey="Lee, J A" sort="Lee, J A" uniqKey="Lee J" first="J.-A." last="Lee">J.-A. Lee</name><affiliation wicri:level="1"><mods:affiliation>Korea Astronomy and Space Science Institute, Daejeon 305-348, Korea</mods:affiliation><country xml:lang="fr">Corée du Sud</country><wicri:regionArea>Korea Astronomy and Space Science Institute, Daejeon 305-348</wicri:regionArea></affiliation></author><author><name sortKey="Lee, C U" sort="Lee, C U" uniqKey="Lee C" first="C.-U." last="Lee">C.-U. Lee</name><affiliation wicri:level="1"><mods:affiliation>Korea Astronomy and Space Science Institute, Daejeon 305-348, Korea</mods:affiliation><country xml:lang="fr">Corée du Sud</country><wicri:regionArea>Korea Astronomy and Space Science Institute, Daejeon 305-348</wicri:regionArea></affiliation></author><author><name sortKey="Nuspl, J" sort="Nuspl, J" uniqKey="Nuspl J" first="J." last="Nuspl">J. Nuspl</name><affiliation wicri:level="1"><mods:affiliation>Konkoly Observatory of the Hungarian Academy of Sciences, H-1525 Budapest, PO Box 67, Hungary</mods:affiliation><country xml:lang="fr">Hongrie</country><wicri:regionArea>Konkoly Observatory of the Hungarian Academy of Sciences, H-1525 Budapest, PO Box 67</wicri:regionArea></affiliation></author><author><name sortKey="Sterken, C" sort="Sterken, C" uniqKey="Sterken C" first="C." last="Sterken">C. Sterken</name><affiliation wicri:level="1"><mods:affiliation>Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels, Belgium</mods:affiliation><country xml:lang="fr">Belgique</country><wicri:regionArea>Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels</wicri:regionArea></affiliation></author><author><name sortKey="Szab, R" sort="Szab, R" uniqKey="Szab R" first="R." last="Szab">R. Szab</name><affiliation wicri:level="1"><mods:affiliation>Konkoly Observatory of the Hungarian Academy of Sciences, H-1525 Budapest, PO Box 67, Hungary</mods:affiliation><country xml:lang="fr">Hongrie</country><wicri:regionArea>Konkoly Observatory of the Hungarian Academy of Sciences, H-1525 Budapest, PO Box 67</wicri:regionArea></affiliation><affiliation wicri:level="1"><mods:affiliation>Physics Department, University of Florida, Gainesville, FL 32611, USA</mods:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Physics Department, University of Florida, Gainesville, FL 32611</wicri:regionArea></affiliation></author></analytic><monogr></monogr><series><title level="j">Monthly Notices of the Royal Astronomical Society</title><title level="j" type="abbrev">Monthly Notices of the Royal Astronomical Society</title><idno type="ISSN">0035-8711</idno><idno type="eISSN">1365-2966</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="2007-07-11">2007-07-11</date><biblScope unit="volume">378</biblScope><biblScope unit="issue">4</biblScope><biblScope unit="page" from="1371">1371</biblScope><biblScope unit="page" to="1384">1384</biblScope></imprint><idno type="ISSN">0035-8711</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0035-8711</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract">We have made an asteroseismic analysis of the variable blue stragglers in the open cluster M67. The data set consists of photometric time-series from eight sites using nine 0.6–2.1 m telescopes with a time-baseline of 43 d. In two stars, EW Cnc and EX Cnc, we detect the highest number of frequencies (41 and 26) detected in δ Scuti stars belonging to a stellar cluster, and EW Cnc has the second highest number of frequencies detected in any δ Scuti star. We have computed a grid of pulsation models that take the effects of rotation into account. The distribution of observed and theoretical frequencies shows that in a wide frequency range a significant fraction of the radial and non-radial low-degree modes are excited to detectable amplitudes. Despite the large number of observed frequencies we cannot constrain the fundamental parameters of the stars. To make progress we need to identify the degrees of some of the modes from either multicolour photometry or spectroscopy.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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