The Asteroseismology Analysis of 14 Solar-like Stars Based on TESS and LAMOST Observations
The Asteroseismology Analysis of 14 Solar-like Stars Based on TESS and LAMOST Observations
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基于TESS和LAMOST观测的14颗类太阳恒星的星震学分析
DOI：
10.3847/1538-4357/ac7b7d
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发表时间：
2022-08
期刊：
影响因子：
--
通讯作者：
Xiaoshuang Zhou
中科院分区：
文献类型：
--
作者：
Ning Gai;Yanke Tang;Zhikai Li;Yu Huang;Wenhui Dong;Xiaoshuang Zhou
摘要凌日系外行星调查卫星(TESS)正在对凌日明亮恒星的行星进行近乎全天的探测。它为类太阳恒星的星震学提供了极好的光度学数据，这些恒星通过对流驱动的机制表现出振荡。本文分析了TESS观测到的14颗恒星的光曲线。这些恒星主要集中在21区以及与21区相交的其他区。通过与LAMOST观测的交叉匹配，选择了14颗具有类太阳振荡信号的恒星，并进行了恒星地震分析。利用PYSYD流水线从其频谱功率谱中提取最大功率νmax频率和大频率间隔Δν。标度关系是一种很有吸引力的方法，可以很容易地立即应用到观测中来推导恒星的性质。为了验证14颗TESS恒星的不同定标标度关系，利用这些关系估计了恒星的基本性质，并与使用全球星震参数和非星震参数约束的格网模拟结果进行了比较。与网格结果相比，新的红巨星分支标度关系高估了半径和质量，而fΔν标度关系导致了整体较低的半径和质量估计。通过网格建模，这些恒星的平均半径不确定度为2%，质量不确定度为3%。无论采用哪种方法，我们都可以得到几乎同样好的所有恒星的logg结果。除了网格法外，新的RGB年龄标度关系为确定恒星年龄提供了一种简单而准确的方法。
Abstract The Transiting Exoplanet Survey Satellite (TESS) is performing a near all-sky survey for planets that transit bright stars. It provides excellent photometric data for asteroseismology of solar-like stars that exhibit oscillation by a convection-driven mechanism. In this paper, we analyze the light curves of 14 stars that are observed by TESS. These stars mainly focus on Sector 21 and the other Sectors intersecting with Sector 21. Through crossmatching with the LAMOST surveys, 14 stars with signals of solar-like oscillations are selected, and asteroseismic analysis is present. The frequency of maximum power ν max and the large frequency separation Δ ν are extracted from its frequency power spectrum using the pySYD pipeline. Scaling relations are an attractive method that can easily and immediately be applied to observations to derive the stellar properties. To validate the different calibrated scaling relations for 14 TESS stars, the fundamental stellar properties are estimated by the relations and compared with grid-based modeling results, which use the constraints of global asteroseismic parameters and nonasteroseismic parameters. The new red-giant branch (RGB) scaling relations are found to overestimate the radius and mass when compared to the grid results, while the f Δ ν scaling relations lead to overall lower radius and mass estimates. The average uncertainties of these stars from grid modeling are within 2% in the radius and 3% in the mass. Regardless of the method, we can get almost equally good results of log g for all the stars. Besides the grid method, the new RGB scaling relations for ages provide a simple and accurate method to determine the stellar ages.
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作者：
V. S. Aguirre;M. Bojsen-Hansen;D. Slumstrup;L. Casagrande;D. Kawata;I. Ciucă;R. Handberg;M. Lund-M.-L
通讯作者：
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作者：
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DOI：
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发表时间：
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期刊：
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