GALAH巡天：多颗恒星和我们的银河系。I. FGK双星性质的综合推导方法
The GALAH survey: Multiple stars and our Galaxy. I. A comprehensive method for deriving properties of FGK binary stars
摘要：
双星系统构成了银河系恒星的很大一部分。它们是研究恒星内部物理过程的有用实验室，在利用恒星观测来研究银河系的结构和演化时必须正确地加以考虑。我们提出了一个样本的12760以及特点双线光谱二进制，适合统计研究的二进制人口。它们被检测为SB 2使用t分布随机邻居嵌入（t-SNE）分类和GALAH光谱的互相关分析。这个样本主要由矮星组成，有相当一部分的演化恒星和几十个巨星分支的成员。为了计算主星和伴星的参数（$T_{\rm eff[1,2]}$、$\log g_{[1,2]}$、[Fe/H]、$V_{r[1,2]}$、$v_{\rm mic[1,2]}$、$v_{\rm broad[1,2]}$、$R_{[1,2]}$和$E(B-V)$），我们使用了贝叶斯方法，其中包括来自盖亚DR 2的视差先验、来自GALAH的光谱以及来自APASS、盖亚DR 2、2 MASS和WISE的视星等。推导出的恒星属性和它们的分布显示的趋势，预计人口的近距离双星（$<$ 10 AU）的质量比$0.5 \leq q \leq 1$。这些双星的金属丰度在统计上低于来自相同星等限制样本的单矮星。
英文摘要：
Binary stellar systems form a large fraction of the Galaxy's stars. They are useful as laboratories for studying the physical processes taking place within stars, and must be correctly taken into account when observations of stars are used to study the structure and evolution of the Galaxy. We present a sample of 12760 well-characterised double-lined spectroscopic binaries that are appropriate for statistical studies of the binary populations. They were detected as SB2s using a t-distributed stochastic neighbour embedding (t-SNE) classification and a cross-correlation analysis of GALAH spectra. This sample consists mostly of dwarfs, with a significant fraction of evolved stars and several dozen members of the giant branch. To compute parameters of the primary and secondary star ($T_{\rm eff[1,2]}$, $\log g_{[1,2]}$, [Fe/H], $V_{r[1,2]}$, $v_{\rm mic[1,2]}$, $v_{\rm broad[1,2]}$, $R_{[1,2]}$, and $E(B-V)$), we used a Bayesian approach that includes a parallax prior from Gaia DR2, spectra from GALAH, and apparent magnitudes from APASS, Gaia DR2, 2MASS, and WISE. The derived stellar properties and their distributions show trends that are expected for a population of close binaries (a $<$ 10 AU) with mass ratios $0.5 \leq q \leq 1$. The derived metallicity of these binary stars is statistically lower than that of single dwarf stars from the same magnitude-limited sample.
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