The binarity of Galactic dwarf stars along with effective temperature and metallicity
The binarity of Galactic dwarf stars along with effective temperature and metallicity
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银河矮星的双星性以及有效温度和金属丰度
DOI：
10.1093/mnrasl/slx048
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发表时间：
2017-03
影响因子：
4.8
通讯作者：
Gao Ran
中科院分区：
文献类型：
--
作者：
Gao Shuang;Zhao He;Yang Hang;Gao Ran
双星分数是探索银河系多星系恒星形成和演化的最有价值的工具之一。我们利用径向速度差(DRV)方法和大天空面积多目标光纤光谱望远镜(LAMOST)观测的大样本，研究了FB与恒星金属丰度([Fe/H])的关系。选取LAMOST第三次数据发布(DR3)中从A-型到K-型的主序恒星来估算Fb。从单星径向速度(RV)误差和双星轨道运动对DRV廓线的贡献进行了评估。最后，我们利用随机重复光谱观测的365,911颗恒星，详细分析了在二维(2D)空间中的Fb和[Fe/H]。与其他恒星相比，A型恒星更有可能成为双星系统中的伙伴。此外，Fb与[Fe/H]之间存在统计上的负相关，这表明Fb是Tef和[Fe/H]的联合函数。同时，对不同温度下的样品进行了[Fe/H]和[Fe/H]的拟合。在我们的样本中，富金属的冷星拥有最好的RV测量。
The fraction of binary stars (fb) is one of most valuable tool to probe the star formation and evolution of multiple systems in the Galaxy. We focus on the relationship between fb and stellar metallicity ([Fe/H]) by employing the differential radial velocity (DRV) method and the large sample observed by the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST). Main-sequence stars from A- to K-types in the third data release (DR3) of LAMOST are selected to estimate fb. Contributions to a profile of DRV from radial velocity (RV) error of single stars (\sigma) and orbital motion of binary stars are evaluated from the profile of DRV. Finally, we employ 365,911 stars with randomly repeating spectral observations to present a detailed analysis of fb and \sigma in the two-dimensional (2D) space of Teff and [Fe/H]. The A-type stars are more likely to be companions in binary star systems than other stars. Furthermore, the reverse correlation between fb and [Fe/H] can be shown statistically, which suggests that fb is a joint function of Teff and [Fe/H]. At the same time, \sigma of the sample for different Teff and [Fe/H] are fitted. Metal-rich cold stars in our sample have the best RV measurement.
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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
影响因子：
1.8
作者：
A. Luo;Hao Zhang;Yongheng Zhao;Gang Zhao;X. Cui;Guo-ping Li;Y. Chu;Jian-rong Shi;Gang Wang-
通讯作者：
A. Luo;Hao Zhang;Yongheng Zhao;Gang Zhao;X. Cui;Guo-ping Li;Y. Chu;Jian-rong Shi;Gang Wang-
DOI：
10.1088/0004-6256/144/2/64
发表时间：
2012-06
期刊：
The Astronomical Journal
影响因子：
--
作者：
S. Dieterich;T. Henry;D. Golimowski;J. Krist;A. Tanner
通讯作者：
S. Dieterich;T. Henry;D. Golimowski;J. Krist;A. Tanner
DOI：
10.1051/aas:2000126
发表时间：
1999-10
期刊：
Astronomy & Astrophysics Supplement Series
影响因子：
--
作者：
L. Girardi;A. Bressan;G. Bertelli;C. Chiosi
通讯作者：
L. Girardi;A. Bressan;G. Bertelli;C. Chiosi