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Smoking gun of the dynamical processing of solar-type field binary stars

文献类型：期刊论文

作者Liu, Chao1,2
刊名MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期2019-11-01
卷号490期号:1页码:550-565
关键词methods: statistical stars: abundances binaries: general stars: formation Hertzsprung-Russell and colour-magnitude diagrams stars: solar-type
ISSN号0035-8711
DOI10.1093/mnras/stz2274
英文摘要I investigate the binarity properties of field stars using more than 50 000 main-sequence stars with stellar mass from 0.4 to 0.85M(circle dot) observed by LAMOST and Gaia in the solar neighbourhood. By adopting a power-law shape for the mass-ratio distribution with a power index of gamma, I conduct a hierarchical Bayesian model to derive the binary fraction (f(b)) and gamma for stellar populations with different metallicities and primary masses (m(1)). I find that f(b) is tightly anticorrelated with gamma; that is, the populations with a smaller binary fraction contain more binaries with a larger mass-ratio, and vice versa. The high-gamma populations, with gamma > 1.2, have a lower stellar mass and higher metallicity, while the low-gamma populations, with gamma < 1.2, have a higher mass and lower metallicity. The f(b) of the high-gamma group is anticorrelated with [Fe/H] but flat with m(1). However, the f(b) of the low-gamma group displays a clear correlation with m(1) but is quite flat with [Fe/H]. The substantial differences are probably due to the dynamical processing that occurred when the binaries were in the embedded star clusters in their early lives. Dynamical processing tends to destroy binaries with a smaller primary mass, smaller mass-ratio, and wider separation. Consequently, the high-gamma group containing stars with a smaller m(1) is influenced more effectively and hence contains fewer binaries, many of which have a larger mass-ratio and shorter period. However, the low-gamma group is less affected by the dynamical processing owing to the larger m(1). These results suggest that dynamical processing works effectively and has significantly altered the present-day binary properties of field stars.
WOS关键词INITIAL MASS FUNCTION ; POPULATION SYNTHESIS ; SPECTROSCOPIC SURVEY ; STELLAR-SYSTEMS ; M-DWARFS ; MULTIPLICITY ; EVOLUTION ; RELEASE ; SEARCH ; PARAMETER
资助项目National Natural Science Foundation of China (NSFC)[11835057] ; NSFC[11333003] ; NSFC[11390372] ; National Development and Reform Commission
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:000496922300042
出版者OXFORD UNIV PRESS
资助机构National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; NSFC ; NSFC ; National Development and Reform Commission ; National Development and Reform Commission ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; NSFC ; NSFC ; National Development and Reform Commission ; National Development and Reform Commission ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; NSFC ; NSFC ; National Development and Reform Commission ; National Development and Reform Commission ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; NSFC ; NSFC ; National Development and Reform Commission ; National Development and Reform Commission
源URL[http://ir.bao.ac.cn/handle/114a11/28184]  
专题中国科学院国家天文台
通讯作者Liu, Chao
作者单位1.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100101, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Liu, Chao. Smoking gun of the dynamical processing of solar-type field binary stars[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2019,490(1):550-565.
APA Liu, Chao.(2019).Smoking gun of the dynamical processing of solar-type field binary stars.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,490(1),550-565.
MLA Liu, Chao."Smoking gun of the dynamical processing of solar-type field binary stars".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 490.1(2019):550-565.

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来源：国家天文台

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