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

doi:10.1093/mnras/stz2274

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	Smoking gun of the dynamical processing of solar-type field binary stars
	Liu, Chao 1,2
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	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
DOI	10.1093/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.
资助项目	National Natural Science Foundation of China (NSFC)[11835057] ; NSFC[11333003] ; NSFC[11390372] ; National Development and Reform Commission
WOS关键词	INITIAL MASS FUNCTION ; POPULATION SYNTHESIS ; SPECTROSCOPIC SURVEY ; STELLAR-SYSTEMS ; M-DWARFS ; MULTIPLICITY ; EVOLUTION ; RELEASE ; SEARCH ; PARAMETER
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	OXFORD UNIV PRESS
WOS记录号	WOS:000496922300042
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
内容类型	期刊论文
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.