| Title | Binary Star Fractions from the LAMOST DR4 |
| Authors | Tian, Zhi-Jia Liu, Xiao-Wei Yuan, Hai-Bo Chen, Bing-Qiu Xiang, Mao-Sheng Huang, Yang Wang, Chun Zhang, Hua-Wei Guo, Jin-Cheng Ren, Juan-Juan Huo, Zhi-Ying Yang, Yong Zhang, Meng Bi, Shao-Lan Yang, Wu-Ming Liu, Kang Zhang, Xian-Fei Li, Tan-Da Wu, Ya-Qian Zhang, Jing-Hua |
| Affiliation | Peking Univ, Dept Astron, Beijing 100871, Peoples R China. Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China. Chinese Acad Sci, Natl Astron Observ, Beijing 100101, Peoples R China. Yunnan Univ, Dept Astron, Kunming 650091, Yunnan, Peoples R China. |
| Keywords | binaries: general binaries: spectroscopic Galaxy: Stella content stars: statistics surveys STELLAR ATMOSPHERIC PARAMETERS SOLAR-TYPE STARS MULTIPLICITY SCIENCE |
| Issue Date | 2018 |
| Publisher | RESEARCH IN ASTRONOMY AND ASTROPHYSICS |
| Citation | RESEARCH IN ASTRONOMY AND ASTROPHYSICS. 2018, 18(5). |
| Abstract | Stellar systems composed of single, double, triple or higher-order systems are rightfully regarded as the fundamental building blocks of the Milky Way. Binary stars play an important role in formation and evolution of the Galaxy. Through comparing the radial velocity variations from multiepoch observations, we analyze the binary fraction of dwarf stars observed with LAMOST. Effects of different model assumptions, such as orbital period distributions on the estimate of binary fractions, are investigated. The results based on log-normal distribution of orbital periods reproduce the previous complete analyses better than the power-law distribution. We find that the binary fraction increases with T-eff and decreases with [Fe/H]. We first investigate the relation between alpha-elements and binary fraction in such a large sample as provided by LAMOST. The old stars with high [alpha/Le] dominate with a higher binary fraction than young stars with low [alpha/Fe]. At the same mass, earlier forming stars possess a higher binary fraction than newly forming ones, which may be related with evolution of the Galaxy. |
| URI | http://hdl.handle.net/20.500.11897/513739 |
| ISSN | 1674-4527 |
| DOI | 10.1088/1674-4527/18/5/52 |
| Indexed | SCI(E) |
| Appears in Collections: | 物理学院 |
