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        Stellar Atmospheric Parameters of M-type Stars from LAMOST DR8

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        Ding_2022_ApJS_260_45.pdf (PDF, 3Mb)
        Author
        Ding, Ming-Yi
        Shi, Jian-Rong
        Wu, Yue
        Jones, Hugh R. A.
        Yan, Hong-liang
        Li, Chun-Qian
        Gao, Qi
        Chen, Tian-Yi
        Zhang, Jing-Hua
        Liu, Shuai
        Yan, Tai-Sheng
        Xie, Xiao-Jin
        Attention
        2299/25628
        Abstract
        The Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) Low Resolution Spectroscopic Survey (LRS) provides massive spectroscopic data of M-type stars, and the derived stellar parameters could bring vital help to various studies. We adopt the ULySS package to perform $\chi^2$ 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 (DR) 8. Comparison with the stellar parameters from 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 $T_{\rm eff}$, $\log{g}$ 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 $\Delta {T_{\rm eff}} =$ $-$176 K for M dwarfs, and a systematic overestimation of $\Delta {\log{g}} =$ 0.30 dex for M giants. However, such differences are less significant when we make comparison with common stars from other literature, which indicates that systematic biases exist in the difference of 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 $T_{\rm eff}$ higher than 2,900 K, with $\log{g}$ from -0.24 dex to 5.9 dex. The typical precisions are 45 K, 0.25 dex and 0.22 dex, for $T_{\rm eff}$, $\log{g}$ and [Fe/H], respectively, which are estimated from the duplicate observations of the same stars.
        Publication date
        2022-06-23
        Published in
        Astrophysical Journal, Supplement Series
        Published version
        https://doi.org/10.3847/1538-4365/ac6754
        Other links
        http://hdl.handle.net/2299/25628
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