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Asteroseismology of KIC 8263801: Is It a Member of NGC 6866 and a Red Clump Star?

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Bellinger,  Earl P.
Max Planck Research Group in Stellar Ages and Galactic Evolution (SAGE), Max Planck Institute for Solar System Research, Max Planck Society;

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Tang, Y., Basu, S., Davies, G. R., Bellinger, E. P., & Gai, N. (2018). Asteroseismology of KIC 8263801: Is It a Member of NGC 6866 and a Red Clump Star? The Astrophysical Journal, 866(1): 59. doi:10.3847/1538-4357/aadcf2.


Cite as: http://hdl.handle.net/21.11116/0000-0003-C399-4
Abstract
American Astronomical Society logo American Astronomical Society logo iop-2016.png iop-2016.png A publishing partnership Asteroseismology of KIC 8263801: Is It a Member of NGC 6866 and a Red Clump Star? Yanke Tang1,2,3, Sarbani Basu2, Guy R. Davies4, Earl P. Bellinger2,5,6,7, and Ning Gai1,2,3 Published 2018 October 11 • © 2018. The American Astronomical Society. All rights reserved. The Astrophysical Journal, Volume 866, Number 1 Download Article PDF DownloadArticle ePub Figures Tables References 87 Total downloads Turn on MathJax Get permission to re-use this article Share this article Share this content via email Share on Facebook Share on Twitter Share on Google+ Share on CiteULike Share on Mendeley Article information Abstract We present an asteroseismic analysis of the Kepler light curve of KIC 8263801, a red-giant star in the open cluster NGC 6866 that has previously been reported to be a helium-burning red-clump (RC) star. We extracted the frequencies of the radial and quadrupole modes from its frequency power spectrum and determined its properties using a grid of evolutionary models constructed with MESA. The oscillation frequencies were calculated using the GYRE code and the surface term was corrected using the Ball & Gizon prescription. We find that the star has a mass of M/M ⊙ = 1.793 ± 0.072, age t = 1.48 ± 0.21 Gyr, and radius R/R ⊙ = 10.53 ± 0.28. By analyzing the internal structure of the best-fitting model, we infer the evolutionary status of the star KIC 8263801 as being on the ascending part of the red-giant branch, and not on the RC. This result is verified using a purely asteroseismic diagnostic, the epsilon c − Δν c diagram which can distinguish red-giant branch stars from red-clump stars. Finally, by comparing its age with NGC 6866 (t = 0.65 ± 0.1 Gyr), we conclude that KIC 8263801 is not a member of this open cluster.