Binary Star Fractions from the LAMOST DR4
Binary Star Fractions from the LAMOST DR4
复制标题
LAMOST DR4 的双星分数
DOI：
10.1088/1674-4527/18/5/52
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发表时间：
2018-02
影响因子：
1.8
通讯作者：
Zhang Jing Hua
中科院分区：
文献类型：
--
作者：
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
由单阶、双阶、三阶或更高阶系统组成的恒星系统被理所当然地视为银河系的基本组成部分。双星在银河系的形成和演化中起着重要的作用。通过比较多历元观测的径向速度变化，分析了LAMOST观测到的矮星双星比例。研究了不同的模型假设，如轨道周期分布对二元分数估计的影响。基于轨道周期对数正态分布的结果比幂律分布的结果更好地再现了之前的完整分析。我们发现二元分数随着Teff的增大而增大，随着[Fe/H]的减小而减小。我们首先在LAMOST提供的大样本中研究α-元素与二元分数的关系。高[α/Fe]的老恒星比低[α/Fe]的年轻恒星具有更高的双星分数。在相同质量下，较早形成的恒星比新形成的恒星拥有更高的双星分数，这可能与银河系的演化有关。
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 multi-epoch 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 Teff and decreases with [Fe/H]. We first investigate the relation between α-elements and binary fraction in such a large sample as provided by LAMOST. The old stars with high [α/Fe] dominate with a higher binary fraction than young stars with low [α/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.
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影响因子：
4.8
作者：
N. Gorynya;A. Tokovinin
通讯作者：
N. Gorynya;A. Tokovinin
DOI：
10.1088/2041-8205/806/1/l2
发表时间：
2015-01
期刊：
The Astrophysical Journal Letters
影响因子：
--
作者：
Thomas Hettinger;C. Badenes;J. Strader;S. Bickerton;T. Beers
通讯作者：
Thomas Hettinger;C. Badenes;J. Strader;S. Bickerton;T. Beers
影响因子：
1.8
作者：
Yue Wu;A. Luo;Haining Li;Jian-rong Shi;P. Prugniel;Yan-chun Liang;Yongheng Zhao;Jian-Na Zhang
通讯作者：
Yue Wu;A. Luo;Haining Li;Jian-rong Shi;P. Prugniel;Yan-chun Liang;Yongheng Zhao;Jian-Na Zhang
DOI：
10.1088/0004-6256/147/4/86
发表时间：
2014-01
期刊：
The Astronomical Journal
影响因子：
--
作者：
A. Tokovinin
通讯作者：
A. Tokovinin
DOI：
10.3847/0004-637x/832/2/121
发表时间：
2016-09
期刊：
The Astrophysical Journal
影响因子：
--
作者：
P. Gaulme;J. McKeever;J. Jackiewicz;M. Rawls;E. Corsaro;B. Mosser;J. Southworth;S. Mahadevan
通讯作者：
P. Gaulme;J. McKeever;J. Jackiewicz;M. Rawls;E. Corsaro;B. Mosser;J. Southworth;S. Mahadevan