论文标题
四百个非常贫穷的星星与Lamost和Subaru一起研究。 I.调查设计，后续程序和二进制频率
Four-hundred Very Metal-poor Stars studied with LAMOST and Subaru. I. Survey Design, Follow-up Program, and Binary Frequency
论文作者
论文摘要
非常贫穷的恒星的化学丰度对第一代恒星的核合成和星系的早期化学演化提供了重要的限制。我们已经使用Subaru望远镜获得了高分辨率光谱，该光谱是针对对用Lamost进行的大量银河恒星进行了大量调查的非常金属贫困星的候选。在这一系列论文中，我们报告了约400颗非常金属贫困的恒星的元素丰度，并讨论了通过结合本研究中测得的径向速度以及Gaia获得的近期天文统计来获得的样品的运动学。本文概述了我们的调查和后续计划，并为整个样本报告了径向速度。我们从高分辨率光谱中鉴定出七个双线光谱二进制物，为此报告了径向速度。我们在非常低的金属性下讨论了这种相对短期二进制的频率。
The chemical abundances of very metal-poor stars provide important constraints on the nucleosynthesis of the first generation of stars and early chemical evolution of the Galaxy. We have obtained high-resolution spectra with the Subaru Telescope for candidates of very metal-poor stars selected with a large survey of Galactic stars carried out with LAMOST. In this series of papers, we report on the elemental abundances of about 400 very metal-poor stars and discuss the kinematics of the sample obtained by combining the radial velocities measured in this study and recent astrometry obtained with Gaia. This paper provides an overview of our survey and follow-up program, and reports radial velocities for the whole sample. We identify seven double-lined spectroscopic binaries from our high-resolution spectra, for which radial velocities of the components are reported. We discuss the frequency of such relatively short-period binaries at very low metallicity.
