中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
More than two hundred and fifty thousand spectroscopic binary or variable star candidates discovered by LAMOST

文献类型:期刊论文

作者Qian SB(钱声帮)1,2,3,4; Shi XD(施相东)1,2,3,4; Zhu LY(朱俐颖)1,2,3,4; Li LJ(李临甲)1,2,3; Zhang J(张嘉)1,2,3; Zhao EG(赵二刚)1,2,3; Han ZT(韩忠涛)1,2,3; Zhou X(周肖)1,2,3; Fang XH(方小慧)1,2,3,4; Liao WP(廖文萍)1,2,3
刊名RESEARCH IN ASTRONOMY AND ASTROPHYSICS
出版日期2019-05-01
卷号19期号:5页码:12
ISSN号1674-4527
关键词stars: fundamental parameters stars: binaries : spectroscopic stars: oscillations stars: binaries : eclipsing stars: variables: other
DOI10.1088/1674-4527/19/5/64
产权排序第1完成单位
文献子类Article
英文摘要

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 than 10 kms(-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 cms(-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 similar to 4. 621 and lower T similar to 4870 K which are mainly cool red dwarf binaries. The second group of SBVCs has log g around 4.171 cms(-2) that includes binaries and pulsating stars such as delta Sct and gamma Dor variables. The gravitational accelerations of the third group of SBVCs are higher and some of them are below the zero-agemain 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 cms(-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.

学科主题天文学 ; 恒星与银河系 ; 恒星天文学
URL标识查看原文
出版地20A DATUN RD, CHAOYANG, BEIJING, 100012, PEOPLES R CHINA
WOS关键词ACCURATE MASSES ; RADIAL-VELOCITY ; LIGHT ; PARAMETERS ; TELESCOPE ; CATALOG
资助项目National Development and Reform Commission
WOS研究方向Astronomy & Astrophysics
语种英语
出版者NATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
WOS记录号WOS:000467595300002
资助机构National Development and Reform Commission
源URL[http://ir.ynao.ac.cn/handle/114a53/20202]  
专题云南天文台_双星与变星研究组
云南天文台_中国科学院天体结构与演化重点实验室
通讯作者Qian SB(钱声帮)
作者单位1.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, China
2.Key Laboratory of the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650216, China
3.Center for Astronomical Mega-Science, Chinese Academy of Sciences, Beijing 100101, China
4.University of Chinese Academy of Sciences, Beijing 100049, China
推荐引用方式
GB/T 7714
Qian SB,Shi XD,Zhu LY,et al. More than two hundred and fifty thousand spectroscopic binary or variable star candidates discovered by LAMOST[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2019,19(5):12.
APA Qian SB.,Shi XD.,Zhu LY.,Li LJ.,Zhang J.,...&Liao WP.(2019).More than two hundred and fifty thousand spectroscopic binary or variable star candidates discovered by LAMOST.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,19(5),12.
MLA Qian SB,et al."More than two hundred and fifty thousand spectroscopic binary or variable star candidates discovered by LAMOST".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 19.5(2019):12.

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来源:云南天文台

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