SIMBAD references

2014MNRAS.445.2999T - Mon. Not. R. Astron. Soc., 445, 2999-3008 (2014/December-2)

Asteroseismic analysis of solar-like star KIC 6225718: constraints on stellar parameters and core overshooting.

TIAN Z.J., BI S.L., YANG W.M., CHEN Y.Q., LIU Z.E., LIU K., LI T.D., GE Z.S. and YU J.

Abstract (from CDS):

We analyse five seasons of short-cadence data of a solar-type star of spectral type F: KIC 6225718 observed by Kepler. We obtain the power spectrum of this star by applying the Lomb-Scargle periodogram to the smoothed time series. By applying the autocorrelation technique to the power spectrum, we derive the large-frequency separation Δν = 105.78±0.65µHz and the frequency of maximum power νmax = 2301±21µHz. We identify 33 p modes with angular degrees of l = 0-2 in the frequency range 1600-2800 µHz of the power spectrum with Bayesian Markov Chain Monte Carlo algorithms. In order to determine the parameters of the star accurately, we construct a grid of stellar models with core overshooting using the Yale stellar evolution code and then perform preliminary seismological analysis. With both asteroseismic and non-asteroseismic constraints, the following range of stellar parameters is estimated: mass M=1.10^+0.04_-0.03  M_☉, radius R = 1.22^+0.01_-0.01 R_☉ and age t=3.35^+0.36_-0.75 Gyr for this star. In addition, we analyse the effects of overshooting on stellar interiors and find that the upper limit of the overshooting parameter αov is approximately 0.2 for this star.

Abstract Copyright: © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2014)

Journal keyword(s): methods: data analysis - stars: fundamental parameters - stars: individual: KIC 6225718 - stars: oscillations

Simbad objects: 5

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