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 |
DOI | 10.1088/1674-4527/19/5/64 |
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. |
入库方式: OAI收割
来源:云南天文台
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