NAOC Open IR
Smoking gun of the dynamical processing of solar-type field binary stars
Liu, Chao1,2
2019-11-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume490Issue:1Pages:550-565
AbstractI 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.
Keywordmethods: statistical stars: abundances binaries: general stars: formation Hertzsprung-Russell and colour-magnitude diagrams stars: solar-type
Funding OrganizationNational 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
DOI10.1093/mnras/stz2274
WOS KeywordINITIAL MASS FUNCTION ; POPULATION SYNTHESIS ; SPECTROSCOPIC SURVEY ; STELLAR-SYSTEMS ; M-DWARFS ; MULTIPLICITY ; EVOLUTION ; RELEASE ; SEARCH ; PARAMETER
Language英语
Funding ProjectNational Natural Science Foundation of China (NSFC)[11835057] ; NSFC[11333003] ; NSFC[11390372] ; National Development and Reform Commission
Funding OrganizationNational 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
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000496922300042
PublisherOXFORD UNIV PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/28185
Collection中国科学院国家天文台
Corresponding AuthorLiu, Chao
Affiliation1.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
Recommended Citation
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.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Liu, Chao]'s Articles
Baidu academic
Similar articles in Baidu academic
[Liu, Chao]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Liu, Chao]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.