An asteroseismic membership study of the red giants in three open clusters observed by Kepler: NGC 6791, NGC 6819, and NGC 6811

Dennis Stello, Søren Meibom, Ronald L. Gilliland, Frank Grundahl, Saskia Hekker, Benoît Mosser, Thomas Kallinger, Savita Mathur, Rafael A. García, Daniel Huber, Sarbani Basu, Timothy R. Bedding, Karsten Brogaard, William J. Chaplin, Yvonne P. Elsworth, Joanna Molenda-Zakowicz, Robert Szabó, Martin Still, Jon M. Jenkins, Jørgen Christensen-DalsgaardHans Kjeldsen, Aldo M. Serenelli, Bill Wohler

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66 Citations (Scopus)

Abstract

Studying star clusters offers significant advances in stellar astrophysics due to the combined power of having many stars with essentially the same distance, age, and initial composition. This makes clusters excellent test benches for verification of stellar evolution theory. To fully exploit this potential, it is vital that the star sample is uncontaminated by stars that are not members of the cluster. Techniques for determining cluster membership therefore play a key role in the investigation of clusters. We present results on three clusters in the Kepler field of view based on a newly established technique that uses asteroseismology to identify fore- or background stars in the field, which demonstrates advantages over classical methods such as kinematic and photometry measurements. Four previously identified seismic non-members in NGC 6819 are confirmed in this study, and three additional non-members are found - two in NGC 6819 and one in NGC 6791. We further highlight which stars are, or might be, affected by blending, which needs to be taken into account when analyzing these Kepler data.

Original languageEnglish
Article number13
JournalAstrophysical Journal
Volume739
Issue number1
DOIs
Publication statusPublished - Sep 20 2011

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Keywords

  • open clusters and associations: individual (NGC 6791, NGC6819, NGC6811)
  • stars: fundamental Parameters
  • stars: interiors
  • stars: oscillations
  • techniques: photometric

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Stello, D., Meibom, S., Gilliland, R. L., Grundahl, F., Hekker, S., Mosser, B., Kallinger, T., Mathur, S., García, R. A., Huber, D., Basu, S., Bedding, T. R., Brogaard, K., Chaplin, W. J., Elsworth, Y. P., Molenda-Zakowicz, J., Szabó, R., Still, M., Jenkins, J. M., ... Wohler, B. (2011). An asteroseismic membership study of the red giants in three open clusters observed by Kepler: NGC 6791, NGC 6819, and NGC 6811. Astrophysical Journal, 739(1), [13]. https://doi.org/10.1088/0004-637X/739/1/13