More than two hundred and fifty thousand spectroscopic binary or variable star candidates discovered by LAMOST

论文摘要

About 786.4 thousand stars were observed by LAMOST twice or more during the first stage of its spectroscopic survey. The radial velocity differences for about 256 thousand targets are larger than10 km s-1 and they are possible spectroscopic binary or variable candidates（SBVCs）. It is shown that most SBVCs are slightly metal poorer than the Sun. There are two peaks in the temperature distribution of SBVCs around 5760 K and 4870 K, while there are three peaks in the distribution of the gravitational acceleration at 2.461, 4.171 and 4.621 cm s-2. The locations of SBVCs on the [Fe/H]-T, [Fe/H]-log g, log g-T and H-R diagrams are investigated. It is found that the detected SBVCs could be classified into four groups. The first group has higher log g～4.621 and lower T ～ 4870 K which are mainly cool red dwarf binaries. The second group of SBVCs has logg around 4.171 cm s-2 that includes binaries and pulsating stars such as δSet and γ Dor variables. The gravitational accelerations of the third group of SBVCs are higher and some of them are below the zero-age main sequence. They may be contact binaries in which the primary components are losing energy to the secondaries in the common envelopes and are at a special stellar evolutionary stage.The last group is composed of giants or supergiants with log g around 2.461 cm s-2 that may be evolved pulsating stars. One target（C134624.29+333921.2） is confirmed as an eclipsing binary with a period of 0.65 days. A preliminary analysis suggests that it is a detached binary with a mass ratio of 0.46. The primary fills its critical Roche lobe by about 89%, indicating that mass transfer will occur between the two components.

论文目录

文章来源

类型: 期刊论文

作者: Sheng-Bang Qian,Xiang-Dong Shi,Li-Ying Zhu,Lin-Jia Li,Jia Zhang,Er-Gang Zhao,Zhong-Tao Han,Xiao Zhou,Xiao-Hui Fang,Wen-Ping Liao

来源: Research in Astronomy and Astrophysics 2019年05期

年度: 2019

分类: 基础科学

专业: 天文学

单位: Yunnan Observatories, Chinese Academy of Sciences,Key Laboratory of the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences,Center for Astronomical Mega-Science, Chinese Academy of Sciences,University of Chinese Academy of Sciences

基金: The Guo Shou Jing Telescope (the Large Sky Area Multi-Object Fiber Spectroscopic Telescope,LAMOST) is a National Major Scientific Project built by the Chinese Academy of Sciences,provided by the National Development and Reform Commission

分类号: P145.2;P153

页码: 17-28

总页数: 12

文件大小: 5743K

下载量: 9

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