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Title: AN ASTEROSEISMIC MEMBERSHIP STUDY OF THE RED GIANTS IN THREE OPEN CLUSTERS OBSERVED BY KEPLER: NGC 6791, NGC 6819, AND NGC 6811

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.

Authors:
; ;  [1];  [2];  [3]; ; ;  [4]; ; ;  [5];  [6];  [7];  [8];  [9];  [10];  [11];  [12];  [13];  [14]
  1. Sydney Institute for Astronomy (SIfA), School of Physics, University of Sydney, NSW 2006 (Australia)
  2. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)
  3. Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MA 21218 (United States)
  4. Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, 8000 Aarhus C (Denmark)
  5. School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT (United Kingdom)
  6. LESIA, CNRS, Universite Pierre et Marie Curie, Universite Denis Diderot, Observatoire de Paris, 92195 Meudon (France)
  7. Institute for Astronomy, University of Vienna, Tuerkenschanzstrasse 17, 1180 Vienna (Austria)
  8. High Altitude Observatory, NCAR, P.O. Box 3000, Boulder, CO 80307 (United States)
  9. Laboratoire AIM, CEA/DSM-CNRS, Universite Paris 7 Diderot, IRFU/SAp, Centre de Saclay, 91191 Gif-sur-Yvette (France)
  10. Department of Astronomy, Yale University, P.O. Box 208101, New Haven, CT 06520-8101 (United States)
  11. Instytut Astronomiczny Uniwersytetu Wroclawskiego, ul. Kopernika 11, 51-622 Wroclaw (Poland)
  12. Konkoly Observatory of the Hungarian Academy of Sciences, Konkoly Thege Miklos ut 15-17, H-1121 Budapest (Hungary)
  13. Bay Area Environmental Research Institute/NASA Ames Research Center, Moffett Field, CA 94035 (United States)
  14. SETI Institute/NASA Ames Research Center, MS 244-30, Moffat Field, CA 94035 (United States)
Publication Date:
OSTI Identifier:
21587535
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 739; Journal Issue: 1; Other Information: DOI: 10.1088/0004-637X/739/1/13; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; OSCILLATIONS; STAR CLUSTERS; STAR EVOLUTION; STARS; EVOLUTION

Citation Formats

Stello, Dennis, Huber, Daniel, Bedding, Timothy R., Meibom, Soeren, Gilliland, Ronald L., Grundahl, Frank, Brogaard, Karsten, Christensen-Dalsgaard, Joergen, Hekker, Saskia, Chaplin, William J., Elsworth, Yvonne P., Mosser, BenoIt, Kallinger, Thomas, Mathur, Savita, GarcIa, Rafael A., Basu, Sarbani, Molenda-Zakowicz, Joanna, Szabo, Robert, Still, Martin, and Jenkins, Jon M. AN ASTEROSEISMIC MEMBERSHIP STUDY OF THE RED GIANTS IN THREE OPEN CLUSTERS OBSERVED BY KEPLER: NGC 6791, NGC 6819, AND NGC 6811. United States: N. p., 2011. Web. doi:10.1088/0004-637X/739/1/13; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA).
Stello, Dennis, Huber, Daniel, Bedding, Timothy R., Meibom, Soeren, Gilliland, Ronald L., Grundahl, Frank, Brogaard, Karsten, Christensen-Dalsgaard, Joergen, Hekker, Saskia, Chaplin, William J., Elsworth, Yvonne P., Mosser, BenoIt, Kallinger, Thomas, Mathur, Savita, GarcIa, Rafael A., Basu, Sarbani, Molenda-Zakowicz, Joanna, Szabo, Robert, Still, Martin, & Jenkins, Jon M. AN ASTEROSEISMIC MEMBERSHIP STUDY OF THE RED GIANTS IN THREE OPEN CLUSTERS OBSERVED BY KEPLER: NGC 6791, NGC 6819, AND NGC 6811. United States. doi:10.1088/0004-637X/739/1/13; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA).
Stello, Dennis, Huber, Daniel, Bedding, Timothy R., Meibom, Soeren, Gilliland, Ronald L., Grundahl, Frank, Brogaard, Karsten, Christensen-Dalsgaard, Joergen, Hekker, Saskia, Chaplin, William J., Elsworth, Yvonne P., Mosser, BenoIt, Kallinger, Thomas, Mathur, Savita, GarcIa, Rafael A., Basu, Sarbani, Molenda-Zakowicz, Joanna, Szabo, Robert, Still, Martin, and Jenkins, Jon M. Tue . "AN ASTEROSEISMIC MEMBERSHIP STUDY OF THE RED GIANTS IN THREE OPEN CLUSTERS OBSERVED BY KEPLER: NGC 6791, NGC 6819, AND NGC 6811". United States. doi:10.1088/0004-637X/739/1/13; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA).
@article{osti_21587535,
title = {AN ASTEROSEISMIC MEMBERSHIP STUDY OF THE RED GIANTS IN THREE OPEN CLUSTERS OBSERVED BY KEPLER: NGC 6791, NGC 6819, AND NGC 6811},
author = {Stello, Dennis and Huber, Daniel and Bedding, Timothy R. and Meibom, Soeren and Gilliland, Ronald L. and Grundahl, Frank and Brogaard, Karsten and Christensen-Dalsgaard, Joergen and Hekker, Saskia and Chaplin, William J. and Elsworth, Yvonne P. and Mosser, BenoIt and Kallinger, Thomas and Mathur, Savita and GarcIa, Rafael A. and Basu, Sarbani and Molenda-Zakowicz, Joanna and Szabo, Robert and Still, Martin and Jenkins, Jon M.},
abstractNote = {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.},
doi = {10.1088/0004-637X/739/1/13; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA)},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 739,
place = {United States},
year = {2011},
month = {9}
}