arXiv 2511.200052025-11-25astro-ph.SRastro-ph.GA

SDSS-V DR19中BOSS M矮星的恒星参数

Stellar Parameters of BOSS M dwarfs in SDSS-V DR19

Dan Qiu, Jennifer A. Johnson, Chao Liu, Diogo Souto, Ilija Medan, Guy S. Stringfellow, Zachary Way, Yuan-sen Ting, Andrew R. Casey, Bárbara Rojas-Ayala, Ricardo… 展开作者

Dan Qiu, Jennifer A. Johnson, Chao Liu, Diogo Souto, Ilija Medan, Guy S. Stringfellow, Zachary Way, Yuan-sen Ting, Andrew R. Casey, Bárbara Rojas-Ayala, Ricardo López-Valdivia, Ying-Yi Song, Bo Zhang, Jiadong Li, Aida Behmard, Szabolcs Mészáros, Keivan G. Stassun, José G. Fernández-Trincado

备注：: 19 pages, 12 Figures

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AI总结：

本文利用SLAM模型推导SDSS-V M矮星的恒星参数，发现其有效温度和表面重力与多种校准方法一致，但与经验关系存在系统偏差，并提供修正方程。

摘要：

我们利用基于支持向量回归的数据驱动模型Stellar LAbel Machine（SLAM），利用BOSS光谱仪获得的低分辨率光学光谱（R≈2000）来推导SDSS-V M矮星的恒星参数（[Fe/H]、T_eff和logg）。这些参数分别通过LAMOST F、G或K矮星伴星（[Fe/H]）和APOGEE Net（T_eff和logg）进行校准。对M+M矮星宽双星两个组成部分的SLAM预测[Fe/H]值的比较显示没有偏差但存在0.11 dex的散射。进一步与另外两项研究的比较，这些研究也通过F/G/K伴星校准M矮星的[Fe/H]，发现偏差分别为-0.06±0.16 dex和0.02±0.14 dex。SLAM推导的有效温度与通过干涉仪角直径校准的温度（偏差：-27±92 K）以及LAMOST的温度（偏差：-34±65 K）相符，但系统性地比通过色指数和T_eff之间经验关系得出的温度低146±45 K。SLAM表面重力与LAMOST的表面重力（偏差：-0.01±0.07 dex）以及通过恒星质量和半径得出的表面重力（偏差：-0.04±0.09 dex）相符。最后，我们研究了SLAM与APOGEE ASPCAP之间的[Fe/H]偏差。它取决于ASPCAP的[Fe/H]和T_eff，我们提供了一个方程来校正ASPCAP的金属度。

英文摘要：

We utilized the Stellar LAbel Machine (SLAM), a data-driven model based on Support Vector Regression, to derive stellar parameters ([Fe/H], $T_{\rm eff}$, and $\log{g}$) for SDSS-V M dwarfs using low-resolution optical spectra (R$\sim$2000) obtained with the BOSS spectrographs. These parameters are calibrated using LAMOST F, G or K dwarf companions ([Fe/H]), and APOGEE Net ($T_{\rm eff}$ and $\log{g}$), respectively. Comparisons of SLAM predicted [Fe/H] values between two components of M+M dwarfs wide binaries show no bias but with a scatter of 0.11 dex. Further comparisons with two other works, which also calibrated the [Fe/H] of M dwarfs by using the F/G/K companions, reveal biases of -0.06$\pm$0.16 dex and 0.02$\pm$0.14 dex, respectively. The SLAM-derived effective temperatures agree well with the temperature which is calibrated by using interferometric angular diameters (bias: -27$\pm$92 K) and those of the LAMOST (bias: -34$\pm$65 K), but are systematically lower than those from an empirical relationship between the color index and $T_{\rm eff}$ by 146$\pm$45 K. The SLAM surface gravity aligns well with those of LAMOST (bias: -0.01$\pm$0.07 dex) and those derived from the stellar mass and radius (bias: -0.04$\pm$0.09 dex). Finally, we investigated a bias in [Fe/H] between SLAM and APOGEE ASPCAP. It depends on ASPCAP's [Fe/H] and $T_{\rm eff}$, we provide an equation to correct the ASPCAP metallicities.

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