2018ApJ...866...59T -
Astrophys. J., 866, 59-59 (2018/October-2)
Asteroseismology of KIC 8263801: is it a member of NGC 6866 and a red clump star?
TANG Y., BASU S., DAVIES G.R., BELLINGER E.P. and GAI N.
Abstract (from CDS):
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 εc - Δνc 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.
Abstract Copyright:
© 2018. The American Astronomical Society. All rights reserved.
Journal keyword(s):
stars: evolution - stars: oscillations - stars: solar-type
Simbad objects:
2
Full paper
View the references in ADS
To bookmark this query, right click on this link: simbad:2018ApJ...866...59T and select 'bookmark this link' or equivalent in the popup menu