2014A&A...563A..23L -
Astronomy and Astrophysics, volume 563A, 23-23 (2014/3-1)
Fundamental stellar parameters of three Kepler stars accurately constrained by lithium abundance and rotation.
LIU K., BI S.L., LI T.D., TIAN Z.J. and GE Z.S.
Abstract (from CDS):
The lithium abundances of
KIC 11395018 and
KIC 10920273 are not compatible with the age of these stars, which is deduced by asteroseismology. To explain this phenomenon, we investigated the possible evolutionary status and performed a seismological analysis of the three stars
KIC 11395018,
KIC 10273246, and
KIC 10920273. Using the Yale Rotating Stellar Evolution Code (YREC), we constructed stellar models that include diffusion and extra-mixing caused by rotation. In addition to the general observed properties, we considered two constraints, the lithium abundance logN(Li) and the rotational period P
rot. A set of stellar fundamental parameters is given by our rotating model for each star. We estimate the mass and age to be 1.24±0.01M
☉ and 5.55±0.20Gyr for
KIC 11395018, 1.19±0.04M
☉ and 4.36±0.29Gyr for
KIC 10273246, and 1.15±0.03M
☉ and 5.68±0.30Gyr for
KIC 10920273. Moreover, the lithium abundance of our rotating model of the three stars agrees well with the observation. The consideration of lithium and the rotational period helped us in obtaining very precise estimates of the star.
Abstract Copyright:
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Journal keyword(s):
stars: evolution - stars: rotation - stars: oscillations
Simbad objects:
3
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