Gilliland, Ronald L.[Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA]
Kjeldsen, Hans[Department of Physics and Astronomy, Aarhus University, 8000 Aarhus C, Denmark]
Arentoft, Torben[Department of Physics and Astronomy, Aarhus University, 8000 Aarhus C, Denmark]
Ballot, Jérôme[Laboratoire d'Astrophysique de Toulouse-Tarbes, Université de Toulouse, CNRS, 14 av E. Belin, 31400 Toulouse, France]
Barban, Caroline[LESIA, CNRS, Université Pierre et Marie Curie, Université Denis Diderot, Observatoire de Paris, 92195 Meudon, France]
Bedding, Timothy R.[Sydney Institute for Astronomy (SIfA), School of Physics, University of Sydney, NSW 2006, Australia]
Chaplin, William J.[School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK]
Elsworth, Yvonne P.[School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK]
García, Rafael A.[Laboratoire AIM, CEA/DSM-CNRS, Université Paris 7 Diderot, IRFU/SAp, Centre de Saclay, 91191 Gif-sur-Yvette, France]
Goupil, Marie-Jo[LESIA, CNRS, Université Pierre et Marie Curie, Université Denis Diderot, Observatoire de Paris, 92195 Meudon, France]
Hekker, Saskia[School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK]
Huber, Daniel[Sydney Institute for Astronomy (SIfA), School of Physics, University of Sydney, NSW 2006, Australia]
Mathur, Savita[Indian Institute of Astrophysics, Koramangala, Bangalore 560 034, India]
Meibom, Søren[Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA]
Sangaralingam, Vinothini[School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK]
Baldner, Charles S.[Department of Astronomy, Yale University, P.O. Box 208101, New Haven, CT 06520-8101, USA]
Belkacem, Kevin[Institut d'Astrophysique et de Géophysique de l'Université de Liège, 17 Allée du 6 Août, B-4000 Liège, Belgium]
Biazzo, Katia[Arcetri Astrophysical Observatory, Largo E. Fermi 5, 50125 Firenze, Italy]
Brogaard, Karsten[Department of Physics and Astronomy, Aarhus University, 8000 Aarhus C, Denmark]
Suárez, Juan Carlos[Instituto de Astrofísica de Andalucía (CSIC), Department Stellar Physics, C.P. 3004, Granada, Spain]
D'Antona, Francesca[INAF-Osservatorio di Roma, via di Frascati 33, I-00040 Monteporzio, Italy]
Demarque, Pierre[Department of Astronomy, Yale University, P.O. Box 208101, New Haven, CT 06520-8101, USA]
Esch, Lisa[Department of Astronomy, Yale University, P.O. Box 208101, New Haven, CT 06520-8101, USA]
Gai, Ning[Department of Astronomy, Yale University, P.O. Box 208101, New Haven, CT 06520-8101, USA; Department of Astronomy, Beijing Normal University, Beijing 100875, China]
Grundahl, Frank[Department of Physics and Astronomy, Aarhus University, 8000 Aarhus C, Denmark]
Lebreton, Yveline[GEPI, Observatoire de Paris, CNRS, Université Paris Diderot, 5 Place Jules Janssen, 92195 Meudon, France]
Jiang, Biwei[Department of Astronomy, Beijing Normal University, Beijing 100875, China]
Jevtic, Nada[Department of Physics & Engineering Technology, Bloomsburg University, 400 East Second Street, Bloomsburg, PA 17815, USA]
Karoff, Christoffer[School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK]
Miglio, Andrea[Institut d'Astrophysique et de Géophysique de l'Université de Liège, 17 Allée du 6 Août, B-4000 Liège, Belgium]
Molenda-Żakowicz, Joanna[Astronomical Institute, University of Wrocław, ul. Kopernika 11, 51-622 Wrocław, Poland]
Montalban Iglesias, Josefa[Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie >]
Noels-Grötsch, Arlette[Institut d'Astrophysique et de Géophysique de l'Université de Liège, 17 Allée du 6 Août, B-4000 Liège, Belgium]
Roca Cortés, Teodoro[Departmento de Astrofíca, Universidad de La Laguna, 38207 La Laguna, Tenerife, Spain; Instituto de Astrofíca de Canarias, 38205 La Laguna, Tenerife, Spain]
Roxburgh, Ian W.[Queen Mary University of London, Mile End Road, London E1 4NS, UK]
Serenelli, Aldo M.[Max Planck Institute for Astrophysics, Karl Schwarzschild Str. 1, Garching bei München D-85741, Germany]
Silva Aguirre, Victor[Max Planck Institute for Astrophysics, Karl Schwarzschild Str. 1, Garching bei München D-85741, Germany]
[en] open clusters and associations: individual: NGC 6819 ; stars: fundamental parameters ; stars: interiors ; stars: oscillations ; techniques: photometric
[en] Asteroseismology of stars in clusters has been a long-sought goal because the assumption of a common age, distance, and initial chemical composition allows strong tests of the theory of stellar evolution. We report results from the first 34 days of science data from the Kepler Mission for the open cluster NGC 6819—one of the four clusters in the field of view. We obtain the first clear detections of solar-like oscillations in the cluster red giants and are able to measure the large frequency separation, Δν, and the frequency of maximum oscillation power, ν[SUB]max[/SUB]. We find that the asteroseismic parameters allow us to test cluster membership of the stars, and even with the limited seismic data in hand, we can already identify four possible non-members despite their having a better than 80% membership probability from radial velocity measurements. We are also able to determine the oscillation amplitudes for stars that span about 2 orders of magnitude in luminosity and find good agreement with the prediction that oscillation amplitudes scale as the luminosity to the power of 0.7. These early results demonstrate the unique potential of asteroseismology of the stellar clusters observed by Kepler.
[Institut d'Astrophysique et de Géophysique de l'Université de Liège, 17 Allée du 6 Août, B-4000 Liège, Belgium]
