Stellar Atmospheric Parameters of M-type Stars from LAMOST DR8
Stellar Atmospheric Parameters of M-type Stars from LAMOST DR8
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DOI：
10.3847/1538-4365/ac6754
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发表时间：
2022-04
期刊：
影响因子：
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通讯作者：
M. Ding;Jianrong Shi;Yue Wu;H. R. Jones;Hong-liang Yan;Chun-qian Li;Q. Gao;Tian-Yi Chen
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文献类型：
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作者：
M. Ding;Jianrong Shi;Yue Wu;H. R. Jones;Hong-liang Yan;Chun-qian Li;Q. Gao;Tian-Yi Chen
大天区多目标光纤光谱望远镜（LAMOST）的低分辨率光谱巡天（LRS）提供了大量的M型恒星光谱数据，由此获得的恒星参数对各种研究都有重要的帮助。我们采用ULySS软件包进行χ 2最小化与模型光谱产生的MILES的，并确定恒星大气参数的M型恒星从LAMOST LRS数据Release 8。与APOGEE恒星参数和化学丰度管道（ASPCAP）的恒星参数比较表明，我们的大部分结果具有良好的一致性。对于M矮星，我们获得的色散优于74 K，0.19 dex，和0.16 dex的Teff，logg，和[Fe/H]，而对于M巨星，内部不确定度分别为58 K，0.32 dex，和0.26 dex。与ASPCAP相比，我们还发现M矮星的系统性低估ΔT eff = −176 K，而M巨星的系统性高估Δlogg = 0.30 dex。然而，当我们与其他文献中的普通恒星进行比较时，这种差异不太显著，这表明ASPCAP与其他测量结果之间的差异存在系统偏差。给出了一个包含763，136个光谱的星表，对应于616，314颗M型恒星，并给出了恒星参数。我们确定的恒星参数与T eff高于2900 K，logg从-0.24 dex到5.9 dex。典型的精度为45 K，0.25 dex和0.22 dex，分别为T eff，logg和[Fe/H]，这是从相同的恒星重复观测估计。
The Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) Low Resolution Spectroscopic Survey (LRS) provides massive spectroscopic data on M-type stars, and the derived stellar parameters could bring vital help to various studies. We adopt the ULySS package to perform χ 2 minimization with model spectra generated from the MILES interpolator and determine the stellar atmospheric parameters for the M-type stars from LAMOST LRS Data Release 8. Comparison with the stellar parameters from the APOGEE Stellar Parameter and Chemical Abundance Pipeline (ASPCAP) suggests that most of our results have good consistency. For M dwarfs, we achieve dispersions better than 74 K, 0.19 dex, and 0.16 dex for T eff, logg , and [Fe/H], while for M giants, the internal uncertainties are 58 K, 0.32 dex, and 0.26 dex, respectively. Compared to ASPCAP we also find a systematic underestimation of ΔT eff = −176 K for M dwarfs and a systematic overestimation of Δlogg = 0.30 dex for M giants. However, such differences are less significant when we make a comparison with common stars from other literature, which indicates that systematic biases exist in the difference between ASPCAP and other measurements. A catalog of 763,136 spectra corresponding to 616,314 M-type stars with derived stellar parameters is presented. We determine the stellar parameters for stars with T eff higher than 2900 K, with logg from −0.24 dex to 5.9 dex. The typical precisions are 45 K, 0.25 dex, and 0.22 dex, for T eff, logg , and [Fe/H], respectively, which are estimated from duplicate observations of the same stars.