Chemical abundances of primary stars in the Sirius-like binary systems

doi:10.1093/mnras/sty280

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	Chemical abundances of primary stars in the Sirius-like binary systems
	Kong, X. M.1,2,3; Zhao, G.1,3; Zhao, J. K.1; Shi, J. R.1,3; Kumar, Y. Bharat 1; Wang, L.1; Zhang, J. B.1; Wang, Y.1; Zhou, Y. T.1,3
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2018-05-01
卷号	476 期号:1 页码:724-740
关键词	stars: abundances binaries: general stars: chemically peculiar stars: fundamental parameters white dwarfs
ISSN号	0035-8711
DOI	10.1093/mnras/sty280
英文摘要	Study of primary stars lying in Sirius-like systems with various masses of white dwarf (WD) companions and orbital separations is one of the key aspects to understand the origin and nature of barium (Ba) stars. In this paper, based on high-resolution and high-S/N spectra, we present systematic analysis of photospheric abundances for 18 FGK primary stars of Sirius-like systems including six giants and 12 dwarfs. Atmospheric parameters, stellar masses, and abundances of 24 elements (C, Na, Mg, Al, Si, S, K, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Sr, Y, Zr, Ba, La, Ce, and Nd) are determined homogeneously. The abundance patterns in these sample stars show that most of the elements in our sample follow the behaviour of field stars with similar metallicity. As expected, s-process elements in four known Ba giants show overabundance. A weak correlation was found between anomalies of s-process elemental abundance and orbital separation, suggesting that the orbital separation of the binaries could not be the main constraint to differentiate strong Ba stars from mild Ba stars. Our study shows that the large mass (>0.51 M-circle dot) of a WD companion in a binary system is not a sufficient condition to form a Ba star, even if the separation between the two components is small. Although not sufficient, it seems to be a necessary condition since Ba stars with lower mass WDs in the observed sample were not found. Our results support that [s/Fe] and [hs/ls] ratios of Ba stars are anti-correlated with the metallicity. However, the different levels of s-process overabundance among Ba stars may not be dominated mainly by the metallicity.
资助项目	National Natural Science Foundation of China[11390371] ; National Natural Science Foundation of China[11233004] ; National Natural Science Foundation of China[U1431106] ; Chinese Academy of Sciences (CAS) through a CAS PIFI fellowship
WOS关键词	BARIUM STARS ; DETAILED ANALYSIS ; ORBITAL ELEMENTS ; MOVING GROUP ; CH STARS ; DWARFS ; EVOLUTION ; MODELS ; SCALE
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	OXFORD UNIV PRESS
WOS记录号	WOS:000429276700058
资助机构	National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences (CAS) through a CAS PIFI fellowship ; Chinese Academy of Sciences (CAS) through a CAS PIFI fellowship ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences (CAS) through a CAS PIFI fellowship ; Chinese Academy of Sciences (CAS) through a CAS PIFI fellowship ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences (CAS) through a CAS PIFI fellowship ; Chinese Academy of Sciences (CAS) through a CAS PIFI fellowship ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences (CAS) through a CAS PIFI fellowship ; Chinese Academy of Sciences (CAS) through a CAS PIFI fellowship
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/37178]
专题	中国科学院国家天文台
通讯作者	Kong, X. M.; Zhao, G.
作者单位	1.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China 2.Shandong Univ Weihai, Sch Mech Elect & Informat Engn, Weihai 264209, Peoples R China 3.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Kong, X. M.,Zhao, G.,Zhao, J. K.,et al. Chemical abundances of primary stars in the Sirius-like binary systems[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2018,476(1):724-740.
APA	Kong, X. M..,Zhao, G..,Zhao, J. K..,Shi, J. R..,Kumar, Y. Bharat.,...&Zhou, Y. T..(2018).Chemical abundances of primary stars in the Sirius-like binary systems.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,476(1),724-740.
MLA	Kong, X. M.,et al."Chemical abundances of primary stars in the Sirius-like binary systems".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 476.1(2018):724-740.