Seismic diagnostics of solar-like oscillating stars

• 来源期刊: 天文和天体物理学研究
• 年，卷（期）: 2017,（5）
• 页码范围: 51-64
• 页数: 14页
• 语种: 英文
• DOI: 10.1088/1674-4527/17/5/44

摘要

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 Av and frequency of maximum power u with autocorrelation function and collapsed autocorrelation function.Second,we extracted individual oscillation modes v,nl with low-ldegree 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 0.02M⊙ 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 (Av,vmax) and non-asteroseismic parameters (Teff,[Fe/H]).We discover that the six targets include five 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.