Seismic diagnostics of solar-like oscillating stars

Ya-Guang Li1, Ming-Hao Du1, Bo-Han Xie1, Zhi-Jia Tian2, Shao-Lan Bi1, Tan-Da Li3,4, Ya-Qian Wu1 and   2017-05-29 00:20:09

1 Department of Astronomy, Beijing Normal University, Beijing 100875, China;;

2 Department of Astronomy, Peking University, Beijing 100871, China;

3 Sydney Institute for Astronomy (SIfA), School of Physics, University of Sydney, NSW 2006, Australia

4 Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark

Received 2017 January 4; accepted 2017 January 24

Abstract High precision and long-lasting Kepler data enabled us to estimate stellar properties with asteroseismology as an accurate tool. We performed asteroseismic analysis on six solar-like stars observed by the Kepler mission: KIC 6064910, KIC 6766513, KIC 7107778, KIC 10079226, KIC 10147635 and KIC 12069127. The extraction of seismic information includes two parts. First, we obtained two global asteroseismic parameters, mean large separation ∆ν and frequency of maximum power νmax, with autocorrelation function and collapsed autocorrelation function. Second, we extracted individual oscillation modes νnl with low-l degree using a least-squares fit. Stellar grid models were built with Yale Rotating Stellar Evolution Code (YREC) to analyze stellar properties. They covered the range of M = 0.8 ∼ 1.8 M⊙ with a step of 0.02 M⊙ and [Fe/H] = −0.3 ∼ 0.4 dex with a step of 0.1 dex. We used a Bayesian approach to estimate stellar fundamental parameters of the six stars, under the constraints of asteroseismic parameters (∆ν, νmax) and non-asteroseismic parameters (Teff , [Fe/H]). We discover that the six targets includefive sub-giant stars with 1.2∼1.5 M⊙and one main-sequence star with 1.08 M⊙, and with ages in the range of 3∼5 Gyr.

Key words: stars: evolution—stars: oscillations—stars: fundamental parameters

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