Asteroseismic inferences on red giants in open clusters NGC 6791, NGC 6819, and NGC 6811 using Kepler
Identifieur interne : 006D16 ( Main/Exploration ); précédent : 006D15; suivant : 006D17Asteroseismic inferences on red giants in open clusters NGC 6791, NGC 6819, and NGC 6811 using Kepler
Auteurs : S. Hekker [Pays-Bas, Royaume-Uni] ; S. Basu [États-Unis] ; D. Stello [Australie] ; T. Kallinger [Canada] ; F. Grundahl [Danemark] ; S. Mathur [États-Unis] ; R. A. Garcia [France] ; B. Mosser [France] ; D. Huber [Australie] ; T. R. Bedding [Australie] ; R. Szabo [Hongrie] ; J. De Ridder [Belgique] ; W. J. Chaplin [Royaume-Uni] ; Y. Elsworth [Royaume-Uni] ; S. J. Hale [Royaume-Uni] ; J. Christensen-Dalsgaard [Danemark] ; R. L. Gilliland [États-Unis] ; M. Still [États-Unis] ; S. Mccauliff [États-Unis] ; E. V. Quintana [États-Unis]Source :
- Astronomy and astrophysics : (Berlin. Print) [ 0004-6361 ] ; 2011.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Amortissement.
English descriptors
- KwdEn :
Abstract
Context. Four open clusters are present in the Kepler field of view and timeseries of nearly a year in length are now available. These timeseries allow us to derive asteroseismic global oscillation parameters of red-giant stars in the three open clusters NGC 6791, NGC 6819 and NGC 6811. From these parameters and effective temperatures, we derive masses, radii and luminosities for the clusters as well as field red giants. Aims. We study the influence of evolution and metallicity on the observed red-giant populations. Methods. The global oscillation parameters are derived using different published methods and the effective temperatures are derived from 2MASS colours. The observational results are compared with BaSTI evolution models. Results. We find that the mass has significant influence on the asteroseismic quantities Δv vs. vmax relation, while the influence of metallicity is negligible, under the assumption that the metallicity does not affect the excitation/damping of the oscillations. The positions of the stars in the H-R diagram depend on both mass and metallicity. Furthermore, the stellar masses derived for the field stars are bracketed by those of the cluster stars. Conclusions. Both the mass and metallicity contribute to the observed difference in locations in the H-R diagram of the old metal-rich cluster NGC 6791 and the middle-aged solar-metallicity cluster NGC 6819. For the young cluster NGC 6811, the explanation of the position of the stars in the H-R diagram challenges the assumption of solar metallicity, and this open cluster might have significantly lower metallicity [Fe/H] in the range -0.3 to -0.7 dex. Also, nearly all the observed field stars seem to be older than NGC 6811 and younger than NGC 6791.
Affiliations:
- Australie, Belgique, Canada, Danemark, France, Hongrie, Pays-Bas, Royaume-Uni, États-Unis
- Angleterre, Hollande-Septentrionale, Hongrie centrale, Midlands de l'Ouest, Nouvelle-Galles du Sud, Province du Brabant flamand, Île-de-France
- Amsterdam, Birmingham, Budapest, Heverlee, Louvain, Paris, Sydney
- Université Pierre-et-Marie-Curie, Université d'Amsterdam, Université de Birmingham, Université de Sydney
Links toward previous steps (curation, corpus...)
- to stream PascalFrancis, to step Corpus: 001908
- to stream PascalFrancis, to step Curation: 004648
- to stream PascalFrancis, to step Checkpoint: 001D27
- to stream Main, to step Merge: 007178
- to stream Main, to step Curation: 006D16
Le document en format XML
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Hekker</name><affiliation wicri:level="4"><inist:fA14 i1="01"><s1>Astronomical Institute "Anton Pannekoek", University of Amsterdam, Science Park 904</s1><s2>1098 XH Amsterdam</s2><s3>NLD</s3><sZ>1 aut.</sZ></inist:fA14><country>Pays-Bas</country><wicri:noRegion>1098 XH Amsterdam</wicri:noRegion><orgName type="university">Université d'Amsterdam</orgName><placeName><settlement type="city">Amsterdam</settlement><region>Hollande-Septentrionale</region></placeName></affiliation><affiliation wicri:level="4"><inist:fA14 i1="02"><s1>School of Physics and Astronomy, University of Birmingham</s1><s2>Edgbaston, Birmingham B 15 2TT</s2><s3>GBR</s3><sZ>1 aut.</sZ><sZ>13 aut.</sZ><sZ>14 aut.</sZ><sZ>15 aut.</sZ></inist:fA14><country>Royaume-Uni</country><placeName><settlement type="city">Birmingham</settlement><region type="country">Angleterre</region><region type="région" nuts="1">Midlands de l'Ouest</region></placeName><orgName type="university">Université de Birmingham</orgName></affiliation></author><author><name sortKey="Basu, S" sort="Basu, S" uniqKey="Basu S" first="S." last="Basu">S. 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Kallinger</name><affiliation wicri:level="1"><inist:fA14 i1="05"><s1>Department of Physics and Astronomy, University of British Colombia, 6224 Agricultural Road</s1><s2>Vancouver, BC V6T 1Z1</s2><s3>CAN</s3><sZ>4 aut.</sZ></inist:fA14><country>Canada</country><wicri:noRegion>Vancouver, BC V6T 1Z1</wicri:noRegion></affiliation></author><author><name sortKey="Grundahl, F" sort="Grundahl, F" uniqKey="Grundahl F" first="F." last="Grundahl">F. Grundahl</name><affiliation wicri:level="1"><inist:fA14 i1="06"><s1>Department of Physics and Astronomy, Building 1520, Aarhus University</s1><s2>8000 Aarhus</s2><s3>DNK</s3><sZ>5 aut.</sZ><sZ>16 aut.</sZ></inist:fA14><country>Danemark</country><wicri:noRegion>8000 Aarhus</wicri:noRegion></affiliation></author><author><name sortKey="Mathur, S" sort="Mathur, S" uniqKey="Mathur S" first="S." last="Mathur">S. Mathur</name><affiliation wicri:level="1"><inist:fA14 i1="07"><s1>High Altitude Observatory, NCAR, PO Box 3000</s1><s2>Boulder, CO 80307</s2><s3>USA</s3><sZ>6 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Boulder, CO 80307</wicri:noRegion></affiliation></author><author><name sortKey="Garcia, R A" sort="Garcia, R A" uniqKey="Garcia R" first="R. A." last="Garcia">R. A. Garcia</name><affiliation wicri:level="1"><inist:fA14 i1="08"><s1>Laboratoire AIM, CEA/DSM-CNRS, Universite Paris 7 Diderot, IRFU/SAp, Centre de Saclay</s1><s2>91191 Gif-sur-Yvette</s2><s3>FRA</s3><sZ>7 aut.</sZ></inist:fA14><country>France</country><wicri:noRegion>91191 Gif-sur-Yvette</wicri:noRegion><wicri:noRegion>Centre de Saclay</wicri:noRegion><wicri:noRegion>91191 Gif-sur-Yvette</wicri:noRegion></affiliation></author><author><name sortKey="Mosser, B" sort="Mosser, B" uniqKey="Mosser B" first="B." last="Mosser">B. Mosser</name><affiliation wicri:level="4"><inist:fA14 i1="09"><s1>LESIA, UMR8109, Université Pierre et Marie Curie, Université Denis Diderot, Observatoire de Paris</s1><s2>92195 Meudon</s2><s3>FRA</s3><sZ>8 aut.</sZ></inist:fA14><country>France</country><wicri:noRegion>92195 Meudon</wicri:noRegion><wicri:noRegion>Observatoire de Paris</wicri:noRegion><wicri:noRegion>92195 Meudon</wicri:noRegion><orgName type="university">Université Pierre-et-Marie-Curie</orgName><placeName><settlement type="city">Paris</settlement><region type="region" nuts="2">Île-de-France</region></placeName></affiliation></author><author><name sortKey="Huber, D" sort="Huber, D" uniqKey="Huber D" first="D." last="Huber">D. Huber</name><affiliation wicri:level="4"><inist:fA14 i1="04"><s1>Sydney Institute for Astronomy (SIfA), School of Physics, University of Sydney</s1><s2>NSW 2006</s2><s3>AUS</s3><sZ>3 aut.</sZ><sZ>9 aut.</sZ><sZ>10 aut.</sZ></inist:fA14><country>Australie</country><placeName><settlement type="city">Sydney</settlement><region type="état">Nouvelle-Galles du Sud</region></placeName><orgName type="university">Université de Sydney</orgName></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="4"><inist:fA14 i1="04"><s1>Sydney Institute for Astronomy (SIfA), School of Physics, University of Sydney</s1><s2>NSW 2006</s2><s3>AUS</s3><sZ>3 aut.</sZ><sZ>9 aut.</sZ><sZ>10 aut.</sZ></inist:fA14><country>Australie</country><placeName><settlement type="city">Sydney</settlement><region type="état">Nouvelle-Galles du Sud</region></placeName><orgName type="university">Université de Sydney</orgName></affiliation></author><author><name sortKey="Szabo, R" sort="Szabo, R" uniqKey="Szabo R" first="R." last="Szabo">R. Szabo</name><affiliation wicri:level="1"><inist:fA14 i1="10"><s1>Konkoly Observatory of the Hungarian Academy of Sciences, Konkoly Thege Miklós út 15-17</s1><s2>1121 Budapest</s2><s3>HUN</s3><sZ>11 aut.</sZ></inist:fA14><country>Hongrie</country><placeName><settlement type="city">Budapest</settlement><region nuts="2">Hongrie centrale</region></placeName></affiliation></author><author><name sortKey="De Ridder, J" sort="De Ridder, J" uniqKey="De Ridder J" first="J." last="De Ridder">J. De Ridder</name><affiliation wicri:level="3"><inist:fA14 i1="11"><s1>Instituut voor Sterrenkunde, K.U. Leuven, Celestijnenlaan 200D</s1><s2>3001 Leuven</s2><s3>BEL</s3><sZ>12 aut.</sZ></inist:fA14><country>Belgique</country><placeName><region type="province" nuts="2">Province du Brabant flamand</region><settlement type="town">Heverlee</settlement><settlement type="city">Louvain</settlement></placeName></affiliation></author><author><name sortKey="Chaplin, W J" sort="Chaplin, W J" uniqKey="Chaplin W" first="W. J." last="Chaplin">W. J. Chaplin</name><affiliation wicri:level="4"><inist:fA14 i1="02"><s1>School of Physics and Astronomy, University of Birmingham</s1><s2>Edgbaston, Birmingham B 15 2TT</s2><s3>GBR</s3><sZ>1 aut.</sZ><sZ>13 aut.</sZ><sZ>14 aut.</sZ><sZ>15 aut.</sZ></inist:fA14><country>Royaume-Uni</country><placeName><settlement type="city">Birmingham</settlement><region type="country">Angleterre</region><region type="région" nuts="1">Midlands de l'Ouest</region></placeName><orgName type="university">Université de Birmingham</orgName></affiliation></author><author><name sortKey="Elsworth, Y" sort="Elsworth, Y" uniqKey="Elsworth Y" first="Y." last="Elsworth">Y. Elsworth</name><affiliation wicri:level="4"><inist:fA14 i1="02"><s1>School of Physics and Astronomy, University of Birmingham</s1><s2>Edgbaston, Birmingham B 15 2TT</s2><s3>GBR</s3><sZ>1 aut.</sZ><sZ>13 aut.</sZ><sZ>14 aut.</sZ><sZ>15 aut.</sZ></inist:fA14><country>Royaume-Uni</country><placeName><settlement type="city">Birmingham</settlement><region type="country">Angleterre</region><region type="région" nuts="1">Midlands de l'Ouest</region></placeName><orgName type="university">Université de Birmingham</orgName></affiliation></author><author><name sortKey="Hale, S J" sort="Hale, S J" uniqKey="Hale S" first="S. J." last="Hale">S. J. Hale</name><affiliation wicri:level="4"><inist:fA14 i1="02"><s1>School of Physics and Astronomy, University of Birmingham</s1><s2>Edgbaston, Birmingham B 15 2TT</s2><s3>GBR</s3><sZ>1 aut.</sZ><sZ>13 aut.</sZ><sZ>14 aut.</sZ><sZ>15 aut.</sZ></inist:fA14><country>Royaume-Uni</country><placeName><settlement type="city">Birmingham</settlement><region type="country">Angleterre</region><region type="région" nuts="1">Midlands de l'Ouest</region></placeName><orgName type="university">Université de Birmingham</orgName></affiliation></author><author><name sortKey="Christensen Dalsgaard, J" sort="Christensen Dalsgaard, J" uniqKey="Christensen Dalsgaard J" first="J." last="Christensen-Dalsgaard">J. Christensen-Dalsgaard</name><affiliation wicri:level="1"><inist:fA14 i1="06"><s1>Department of Physics and Astronomy, Building 1520, Aarhus University</s1><s2>8000 Aarhus</s2><s3>DNK</s3><sZ>5 aut.</sZ><sZ>16 aut.</sZ></inist:fA14><country>Danemark</country><wicri:noRegion>8000 Aarhus</wicri:noRegion></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"><inist:fA14 i1="12"><s1>Space Telescope Science Institute, 3700 San Martin Drive</s1><s2>Baltimore, MD 21218</s2><s3>USA</s3><sZ>17 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Baltimore, MD 21218</wicri:noRegion></affiliation></author><author><name sortKey="Still, M" sort="Still, M" uniqKey="Still M" first="M." last="Still">M. Still</name><affiliation wicri:level="1"><inist:fA14 i1="13"><s1>Bay Area Environmental Research Institute/Nasa Ames Research Center</s1><s2>Moffett Field, CA 94035</s2><s3>USA</s3><sZ>18 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Bay Area Environmental Research Institute/Nasa Ames Research Center</wicri:noRegion></affiliation></author><author><name sortKey="Mccauliff, S" sort="Mccauliff, S" uniqKey="Mccauliff S" first="S." last="Mccauliff">S. Mccauliff</name><affiliation wicri:level="1"><inist:fA14 i1="14"><s1>Orbital Sciences Corporation/Nasa Ames Research Center</s1><s2>Moffett Field, CA 94035</s2><s3>USA</s3><sZ>19 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Orbital Sciences Corporation/Nasa Ames Research Center</wicri:noRegion></affiliation></author><author><name sortKey="Quintana, E V" sort="Quintana, E V" uniqKey="Quintana E" first="E. V." last="Quintana">E. V. Quintana</name><affiliation wicri:level="1"><inist:fA14 i1="15"><s1>SETI Institute/Nasa Ames Research Center</s1><s2>Moffett Field, CA 94035</s2><s3>USA</s3><sZ>20 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>SETI Institute/Nasa Ames Research Center</wicri:noRegion></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">INIST</idno><idno type="inist">11-0448036</idno><date when="2011">2011</date><idno type="stanalyst">PASCAL 11-0448036 INIST</idno><idno type="RBID">Pascal:11-0448036</idno><idno type="wicri:Area/PascalFrancis/Corpus">001908</idno><idno type="wicri:Area/PascalFrancis/Curation">004648</idno><idno type="wicri:Area/PascalFrancis/Checkpoint">001D27</idno><idno type="wicri:explorRef" wicri:stream="PascalFrancis" wicri:step="Checkpoint">001D27</idno><idno type="wicri:doubleKey">0004-6361:2011:Hekker S:asteroseismic:inferences:on</idno><idno type="wicri:Area/Main/Merge">007178</idno><idno type="wicri:Area/Main/Curation">006D16</idno><idno type="wicri:Area/Main/Exploration">006D16</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Asteroseismic inferences on red giants in open clusters NGC 6791, NGC 6819, and NGC 6811 using Kepler</title><author><name sortKey="Hekker, S" sort="Hekker, S" uniqKey="Hekker S" first="S." last="Hekker">S. Hekker</name><affiliation wicri:level="4"><inist:fA14 i1="01"><s1>Astronomical Institute "Anton Pannekoek", University of Amsterdam, Science Park 904</s1><s2>1098 XH Amsterdam</s2><s3>NLD</s3><sZ>1 aut.</sZ></inist:fA14><country>Pays-Bas</country><wicri:noRegion>1098 XH Amsterdam</wicri:noRegion><orgName type="university">Université d'Amsterdam</orgName><placeName><settlement type="city">Amsterdam</settlement><region>Hollande-Septentrionale</region></placeName></affiliation><affiliation wicri:level="4"><inist:fA14 i1="02"><s1>School of Physics and Astronomy, University of Birmingham</s1><s2>Edgbaston, Birmingham B 15 2TT</s2><s3>GBR</s3><sZ>1 aut.</sZ><sZ>13 aut.</sZ><sZ>14 aut.</sZ><sZ>15 aut.</sZ></inist:fA14><country>Royaume-Uni</country><placeName><settlement type="city">Birmingham</settlement><region type="country">Angleterre</region><region type="région" nuts="1">Midlands de l'Ouest</region></placeName><orgName type="university">Université de Birmingham</orgName></affiliation></author><author><name sortKey="Basu, S" sort="Basu, S" uniqKey="Basu S" first="S." last="Basu">S. Basu</name><affiliation wicri:level="1"><inist:fA14 i1="03"><s1>Department of Astronomy, Yale University, PO Box 208101</s1><s2>New Haven CT 06520-8101</s2><s3>USA</s3><sZ>2 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>New Haven CT 06520-8101</wicri:noRegion></affiliation></author><author><name sortKey="Stello, D" sort="Stello, D" uniqKey="Stello D" first="D." last="Stello">D. Stello</name><affiliation wicri:level="4"><inist:fA14 i1="04"><s1>Sydney Institute for Astronomy (SIfA), School of Physics, University of Sydney</s1><s2>NSW 2006</s2><s3>AUS</s3><sZ>3 aut.</sZ><sZ>9 aut.</sZ><sZ>10 aut.</sZ></inist:fA14><country>Australie</country><placeName><settlement type="city">Sydney</settlement><region type="état">Nouvelle-Galles du Sud</region></placeName><orgName type="university">Université de Sydney</orgName></affiliation></author><author><name sortKey="Kallinger, T" sort="Kallinger, T" uniqKey="Kallinger T" first="T." last="Kallinger">T. Kallinger</name><affiliation wicri:level="1"><inist:fA14 i1="05"><s1>Department of Physics and Astronomy, University of British Colombia, 6224 Agricultural Road</s1><s2>Vancouver, BC V6T 1Z1</s2><s3>CAN</s3><sZ>4 aut.</sZ></inist:fA14><country>Canada</country><wicri:noRegion>Vancouver, BC V6T 1Z1</wicri:noRegion></affiliation></author><author><name sortKey="Grundahl, F" sort="Grundahl, F" uniqKey="Grundahl F" first="F." last="Grundahl">F. Grundahl</name><affiliation wicri:level="1"><inist:fA14 i1="06"><s1>Department of Physics and Astronomy, Building 1520, Aarhus University</s1><s2>8000 Aarhus</s2><s3>DNK</s3><sZ>5 aut.</sZ><sZ>16 aut.</sZ></inist:fA14><country>Danemark</country><wicri:noRegion>8000 Aarhus</wicri:noRegion></affiliation></author><author><name sortKey="Mathur, S" sort="Mathur, S" uniqKey="Mathur S" first="S." last="Mathur">S. Mathur</name><affiliation wicri:level="1"><inist:fA14 i1="07"><s1>High Altitude Observatory, NCAR, PO Box 3000</s1><s2>Boulder, CO 80307</s2><s3>USA</s3><sZ>6 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Boulder, CO 80307</wicri:noRegion></affiliation></author><author><name sortKey="Garcia, R A" sort="Garcia, R A" uniqKey="Garcia R" first="R. A." last="Garcia">R. A. Garcia</name><affiliation wicri:level="1"><inist:fA14 i1="08"><s1>Laboratoire AIM, CEA/DSM-CNRS, Universite Paris 7 Diderot, IRFU/SAp, Centre de Saclay</s1><s2>91191 Gif-sur-Yvette</s2><s3>FRA</s3><sZ>7 aut.</sZ></inist:fA14><country>France</country><wicri:noRegion>91191 Gif-sur-Yvette</wicri:noRegion><wicri:noRegion>Centre de Saclay</wicri:noRegion><wicri:noRegion>91191 Gif-sur-Yvette</wicri:noRegion></affiliation></author><author><name sortKey="Mosser, B" sort="Mosser, B" uniqKey="Mosser B" first="B." last="Mosser">B. Mosser</name><affiliation wicri:level="4"><inist:fA14 i1="09"><s1>LESIA, UMR8109, Université Pierre et Marie Curie, Université Denis Diderot, Observatoire de Paris</s1><s2>92195 Meudon</s2><s3>FRA</s3><sZ>8 aut.</sZ></inist:fA14><country>France</country><wicri:noRegion>92195 Meudon</wicri:noRegion><wicri:noRegion>Observatoire de Paris</wicri:noRegion><wicri:noRegion>92195 Meudon</wicri:noRegion><orgName type="university">Université Pierre-et-Marie-Curie</orgName><placeName><settlement type="city">Paris</settlement><region type="region" nuts="2">Île-de-France</region></placeName></affiliation></author><author><name sortKey="Huber, D" sort="Huber, D" uniqKey="Huber D" first="D." last="Huber">D. Huber</name><affiliation wicri:level="4"><inist:fA14 i1="04"><s1>Sydney Institute for Astronomy (SIfA), School of Physics, University of Sydney</s1><s2>NSW 2006</s2><s3>AUS</s3><sZ>3 aut.</sZ><sZ>9 aut.</sZ><sZ>10 aut.</sZ></inist:fA14><country>Australie</country><placeName><settlement type="city">Sydney</settlement><region type="état">Nouvelle-Galles du Sud</region></placeName><orgName type="university">Université de Sydney</orgName></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="4"><inist:fA14 i1="04"><s1>Sydney Institute for Astronomy (SIfA), School of Physics, University of Sydney</s1><s2>NSW 2006</s2><s3>AUS</s3><sZ>3 aut.</sZ><sZ>9 aut.</sZ><sZ>10 aut.</sZ></inist:fA14><country>Australie</country><placeName><settlement type="city">Sydney</settlement><region type="état">Nouvelle-Galles du Sud</region></placeName><orgName type="university">Université de Sydney</orgName></affiliation></author><author><name sortKey="Szabo, R" sort="Szabo, R" uniqKey="Szabo R" first="R." last="Szabo">R. Szabo</name><affiliation wicri:level="1"><inist:fA14 i1="10"><s1>Konkoly Observatory of the Hungarian Academy of Sciences, Konkoly Thege Miklós út 15-17</s1><s2>1121 Budapest</s2><s3>HUN</s3><sZ>11 aut.</sZ></inist:fA14><country>Hongrie</country><placeName><settlement type="city">Budapest</settlement><region nuts="2">Hongrie centrale</region></placeName></affiliation></author><author><name sortKey="De Ridder, J" sort="De Ridder, J" uniqKey="De Ridder J" first="J." last="De Ridder">J. De Ridder</name><affiliation wicri:level="3"><inist:fA14 i1="11"><s1>Instituut voor Sterrenkunde, K.U. Leuven, Celestijnenlaan 200D</s1><s2>3001 Leuven</s2><s3>BEL</s3><sZ>12 aut.</sZ></inist:fA14><country>Belgique</country><placeName><region type="province" nuts="2">Province du Brabant flamand</region><settlement type="town">Heverlee</settlement><settlement type="city">Louvain</settlement></placeName></affiliation></author><author><name sortKey="Chaplin, W J" sort="Chaplin, W J" uniqKey="Chaplin W" first="W. J." last="Chaplin">W. J. Chaplin</name><affiliation wicri:level="4"><inist:fA14 i1="02"><s1>School of Physics and Astronomy, University of Birmingham</s1><s2>Edgbaston, Birmingham B 15 2TT</s2><s3>GBR</s3><sZ>1 aut.</sZ><sZ>13 aut.</sZ><sZ>14 aut.</sZ><sZ>15 aut.</sZ></inist:fA14><country>Royaume-Uni</country><placeName><settlement type="city">Birmingham</settlement><region type="country">Angleterre</region><region type="région" nuts="1">Midlands de l'Ouest</region></placeName><orgName type="university">Université de Birmingham</orgName></affiliation></author><author><name sortKey="Elsworth, Y" sort="Elsworth, Y" uniqKey="Elsworth Y" first="Y." last="Elsworth">Y. Elsworth</name><affiliation wicri:level="4"><inist:fA14 i1="02"><s1>School of Physics and Astronomy, University of Birmingham</s1><s2>Edgbaston, Birmingham B 15 2TT</s2><s3>GBR</s3><sZ>1 aut.</sZ><sZ>13 aut.</sZ><sZ>14 aut.</sZ><sZ>15 aut.</sZ></inist:fA14><country>Royaume-Uni</country><placeName><settlement type="city">Birmingham</settlement><region type="country">Angleterre</region><region type="région" nuts="1">Midlands de l'Ouest</region></placeName><orgName type="university">Université de Birmingham</orgName></affiliation></author><author><name sortKey="Hale, S J" sort="Hale, S J" uniqKey="Hale S" first="S. J." last="Hale">S. J. Hale</name><affiliation wicri:level="4"><inist:fA14 i1="02"><s1>School of Physics and Astronomy, University of Birmingham</s1><s2>Edgbaston, Birmingham B 15 2TT</s2><s3>GBR</s3><sZ>1 aut.</sZ><sZ>13 aut.</sZ><sZ>14 aut.</sZ><sZ>15 aut.</sZ></inist:fA14><country>Royaume-Uni</country><placeName><settlement type="city">Birmingham</settlement><region type="country">Angleterre</region><region type="région" nuts="1">Midlands de l'Ouest</region></placeName><orgName type="university">Université de Birmingham</orgName></affiliation></author><author><name sortKey="Christensen Dalsgaard, J" sort="Christensen Dalsgaard, J" uniqKey="Christensen Dalsgaard J" first="J." last="Christensen-Dalsgaard">J. Christensen-Dalsgaard</name><affiliation wicri:level="1"><inist:fA14 i1="06"><s1>Department of Physics and Astronomy, Building 1520, Aarhus University</s1><s2>8000 Aarhus</s2><s3>DNK</s3><sZ>5 aut.</sZ><sZ>16 aut.</sZ></inist:fA14><country>Danemark</country><wicri:noRegion>8000 Aarhus</wicri:noRegion></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"><inist:fA14 i1="12"><s1>Space Telescope Science Institute, 3700 San Martin Drive</s1><s2>Baltimore, MD 21218</s2><s3>USA</s3><sZ>17 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Baltimore, MD 21218</wicri:noRegion></affiliation></author><author><name sortKey="Still, M" sort="Still, M" uniqKey="Still M" first="M." last="Still">M. Still</name><affiliation wicri:level="1"><inist:fA14 i1="13"><s1>Bay Area Environmental Research Institute/Nasa Ames Research Center</s1><s2>Moffett Field, CA 94035</s2><s3>USA</s3><sZ>18 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Bay Area Environmental Research Institute/Nasa Ames Research Center</wicri:noRegion></affiliation></author><author><name sortKey="Mccauliff, S" sort="Mccauliff, S" uniqKey="Mccauliff S" first="S." last="Mccauliff">S. Mccauliff</name><affiliation wicri:level="1"><inist:fA14 i1="14"><s1>Orbital Sciences Corporation/Nasa Ames Research Center</s1><s2>Moffett Field, CA 94035</s2><s3>USA</s3><sZ>19 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>Orbital Sciences Corporation/Nasa Ames Research Center</wicri:noRegion></affiliation></author><author><name sortKey="Quintana, E V" sort="Quintana, E V" uniqKey="Quintana E" first="E. V." last="Quintana">E. V. Quintana</name><affiliation wicri:level="1"><inist:fA14 i1="15"><s1>SETI Institute/Nasa Ames Research Center</s1><s2>Moffett Field, CA 94035</s2><s3>USA</s3><sZ>20 aut.</sZ></inist:fA14><country>États-Unis</country><wicri:noRegion>SETI Institute/Nasa Ames Research Center</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">Astronomy and astrophysics : (Berlin. Print)</title><title level="j" type="abbreviated">Astron. astrophys. : (Berl., Print)</title><idno type="ISSN">0004-6361</idno><imprint><date when="2011">2011</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Astronomy and astrophysics : (Berlin. Print)</title><title level="j" type="abbreviated">Astron. astrophys. : (Berl., Print)</title><idno type="ISSN">0004-6361</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Astroseismology</term><term>Color</term><term>Damping</term><term>Effective temperature</term><term>Excitation</term><term>Giant stars</term><term>Late type stars</term><term>Luminosity</term><term>Metallicity</term><term>Models</term><term>Open clusters</term><term>Positions</term><term>Red giant stars</term><term>Red stars</term><term>Star clusters</term><term>Stellar mass</term><term>Young cluster</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Géante rouge</term><term>Amas ouvert</term><term>Etoile rouge</term><term>Etoile géante</term><term>Température effective</term><term>Luminosité</term><term>Métallicité</term><term>Couleur</term><term>Modèle</term><term>Excitation</term><term>Amortissement</term><term>Position</term><term>Masse stellaire</term><term>Amas stellaire</term><term>Amas jeune</term><term>Etoile type avancé</term><term>Astéroséismologie</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Amortissement</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Context. Four open clusters are present in the Kepler field of view and timeseries of nearly a year in length are now available. These timeseries allow us to derive asteroseismic global oscillation parameters of red-giant stars in the three open clusters NGC 6791, NGC 6819 and NGC 6811. From these parameters and effective temperatures, we derive masses, radii and luminosities for the clusters as well as field red giants. Aims. We study the influence of evolution and metallicity on the observed red-giant populations. Methods. The global oscillation parameters are derived using different published methods and the effective temperatures are derived from 2MASS colours. The observational results are compared with BaSTI evolution models. Results. We find that the mass has significant influence on the asteroseismic quantities Δv vs. v<sub>max</sub> relation, while the influence of metallicity is negligible, under the assumption that the metallicity does not affect the excitation/damping of the oscillations. The positions of the stars in the H-R diagram depend on both mass and metallicity. Furthermore, the stellar masses derived for the field stars are bracketed by those of the cluster stars. Conclusions. Both the mass and metallicity contribute to the observed difference in locations in the H-R diagram of the old metal-rich cluster NGC 6791 and the middle-aged solar-metallicity cluster NGC 6819. For the young cluster NGC 6811, the explanation of the position of the stars in the H-R diagram challenges the assumption of solar metallicity, and this open cluster might have significantly lower metallicity [Fe/H] in the range -0.3 to -0.7 dex. Also, nearly all the observed field stars seem to be older than NGC 6811 and younger than NGC 6791.</div></front></TEI><affiliations><list><country><li>Australie</li><li>Belgique</li><li>Canada</li><li>Danemark</li><li>France</li><li>Hongrie</li><li>Pays-Bas</li><li>Royaume-Uni</li><li>États-Unis</li></country><region><li>Angleterre</li><li>Hollande-Septentrionale</li><li>Hongrie centrale</li><li>Midlands de l'Ouest</li><li>Nouvelle-Galles du Sud</li><li>Province du Brabant flamand</li><li>Île-de-France</li></region><settlement><li>Amsterdam</li><li>Birmingham</li><li>Budapest</li><li>Heverlee</li><li>Louvain</li><li>Paris</li><li>Sydney</li></settlement><orgName><li>Université Pierre-et-Marie-Curie</li><li>Université d'Amsterdam</li><li>Université de Birmingham</li><li>Université de Sydney</li></orgName></list><tree><country name="Pays-Bas"><region name="Hollande-Septentrionale"><name sortKey="Hekker, S" sort="Hekker, S" uniqKey="Hekker S" first="S." last="Hekker">S. Hekker</name></region></country><country name="Royaume-Uni"><region name="Angleterre"><name sortKey="Hekker, S" sort="Hekker, S" uniqKey="Hekker S" first="S." last="Hekker">S. Hekker</name></region><name sortKey="Chaplin, W J" sort="Chaplin, W J" uniqKey="Chaplin W" first="W. J." last="Chaplin">W. J. Chaplin</name><name sortKey="Elsworth, Y" sort="Elsworth, Y" uniqKey="Elsworth Y" first="Y." last="Elsworth">Y. Elsworth</name><name sortKey="Hale, S J" sort="Hale, S J" uniqKey="Hale S" first="S. J." last="Hale">S. J. Hale</name></country><country name="États-Unis"><noRegion><name sortKey="Basu, S" sort="Basu, S" uniqKey="Basu S" first="S." last="Basu">S. Basu</name></noRegion><name sortKey="Gilliland, R L" sort="Gilliland, R L" uniqKey="Gilliland R" first="R. L." last="Gilliland">R. L. Gilliland</name><name sortKey="Mathur, S" sort="Mathur, S" uniqKey="Mathur S" first="S." last="Mathur">S. Mathur</name><name sortKey="Mccauliff, S" sort="Mccauliff, S" uniqKey="Mccauliff S" first="S." last="Mccauliff">S. Mccauliff</name><name sortKey="Quintana, E V" sort="Quintana, E V" uniqKey="Quintana E" first="E. V." last="Quintana">E. V. Quintana</name><name sortKey="Still, M" sort="Still, M" uniqKey="Still M" first="M." last="Still">M. Still</name></country><country name="Australie"><region name="Nouvelle-Galles du Sud"><name sortKey="Stello, D" sort="Stello, D" uniqKey="Stello D" first="D." last="Stello">D. Stello</name></region><name sortKey="Bedding, T R" sort="Bedding, T R" uniqKey="Bedding T" first="T. R." last="Bedding">T. R. Bedding</name><name sortKey="Huber, D" sort="Huber, D" uniqKey="Huber D" first="D." last="Huber">D. Huber</name></country><country name="Canada"><noRegion><name sortKey="Kallinger, T" sort="Kallinger, T" uniqKey="Kallinger T" first="T." last="Kallinger">T. Kallinger</name></noRegion></country><country name="Danemark"><noRegion><name sortKey="Grundahl, F" sort="Grundahl, F" uniqKey="Grundahl F" first="F." last="Grundahl">F. Grundahl</name></noRegion><name sortKey="Christensen Dalsgaard, J" sort="Christensen Dalsgaard, J" uniqKey="Christensen Dalsgaard J" first="J." last="Christensen-Dalsgaard">J. Christensen-Dalsgaard</name></country><country name="France"><noRegion><name sortKey="Garcia, R A" sort="Garcia, R A" uniqKey="Garcia R" first="R. A." last="Garcia">R. A. Garcia</name></noRegion><name sortKey="Mosser, B" sort="Mosser, B" uniqKey="Mosser B" first="B." last="Mosser">B. Mosser</name></country><country name="Hongrie"><region name="Hongrie centrale"><name sortKey="Szabo, R" sort="Szabo, R" uniqKey="Szabo R" first="R." last="Szabo">R. Szabo</name></region></country><country name="Belgique"><region name="Province du Brabant flamand"><name sortKey="De Ridder, J" sort="De Ridder, J" uniqKey="De Ridder J" first="J." last="De Ridder">J. 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