Tracing the Origin of Moving Groups. II. Chemical Abundance of Six Stars in the Halo Stream LAMOST-N1

doi:10.3847/1538-4357/aae712

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	Tracing the Origin of Moving Groups. II. Chemical Abundance of Six Stars in the Halo Stream LAMOST-N1
	Zhao, J. K.2; Zhao, G.2,3; Aoki, W.1,4; Ishigaki, M. N.5; Suda, T.6; Matsuno, T.1,4; Shi, J. R.2; Xing, Q. F.2; Chen, Y. Q.2,3; Oswalt, Terry D.7
刊名	ASTROPHYSICAL JOURNAL
	2018-12-01
卷号	868 期号:2 页码:19
关键词	Galaxy: kinematics and dynamics stars: abundances stars: late-type
ISSN号	0004-637X
DOI	10.3847/1538-4357/aae712
英文摘要	We present the chemical abundances of six stars in the halo stream Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST)-N1, a new kinematically selected substructure from LAMOST data, from high-resolution spectra obtained with the Subaru/High Dispersion Spectrograph. Atmospheric parameters were determined by an iterative procedure based on spectroscopic analysis. Abundances of 11 elements, including a elements (Mg, Ca, Ti), odd-Z light elements (Na), iron-peak elements (Sc, Cr, Mn, Fe, Ni), and neutron-capture elements (Y, Ba), are measured by local thermodynamic equilibrium analysis procedures. [Fe/H] of the six stars ranges from -1.5 to -0.66. The abundance patterns of a elements show a similar trend to those of low-a stars in Nissen et al. and over 0.1 dex lower than those of Galactic field stars. The Sc, Cr, Mn, and Ni abundances of these six stars exhibit a positive trend with increasing iron abundance, with varying gradients. In addition, abundance distribution between [Na/Fe] and [Ni/Fe] and between that of [Ba/Y] and [Fe/H] of these six stars is different from both Galactic stars and the known dwarf galaxies. Our results suggest that LAMOST-N1 might be a relic of a system with slower chemical evolutions than the Milky Way.
资助项目	Astronomical Big Data Joint Research Center ; National Natural Science Foundation of China[11390371] ; National Natural Science Foundation of China[11573035] ; National Natural Science Foundation of China[11625313] ; National Key Basic Research Program of China (973 program)[2014CB845701/03] ; US National Science Foundation[AST-1358787] ; National Development and Reform Commission
WOS关键词	DIGITAL SKY SURVEY ; LTE LINE FORMATION ; METAL-POOR STARS ; STELLAR HALO ; SOLAR NEIGHBORHOOD ; GALAXY ; DWARF ; SAGITTARIUS ; SIGNATURES ; DEBRIS
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000451432300018
资助机构	Astronomical Big Data Joint Research Center ; Astronomical Big Data Joint Research Center ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Basic Research Program of China (973 program) ; National Key Basic Research Program of China (973 program) ; US National Science Foundation ; US National Science Foundation ; National Development and Reform Commission ; National Development and Reform Commission ; Astronomical Big Data Joint Research Center ; Astronomical Big Data Joint Research Center ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Basic Research Program of China (973 program) ; National Key Basic Research Program of China (973 program) ; US National Science Foundation ; US National Science Foundation ; National Development and Reform Commission ; National Development and Reform Commission ; Astronomical Big Data Joint Research Center ; Astronomical Big Data Joint Research Center ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Basic Research Program of China (973 program) ; National Key Basic Research Program of China (973 program) ; US National Science Foundation ; US National Science Foundation ; National Development and Reform Commission ; National Development and Reform Commission ; Astronomical Big Data Joint Research Center ; Astronomical Big Data Joint Research Center ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Basic Research Program of China (973 program) ; National Key Basic Research Program of China (973 program) ; US National Science Foundation ; US National Science Foundation ; 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/114a11/23657]
专题	中国科学院国家天文台
通讯作者	Zhao, J. K.
作者单位	1.Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan 2.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100012, Peoples R China 3.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China 4.Grad Univ Adv Studies SOKENDAI, Dept Astron Sci, Sch Phys Sci, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan 5.Univ Tokyo, Kavli Inst Phys & Math Universe WPI, Todai Inst Adv Study, 5-1-5 Kashiwanoha, Kashiwa, Chiba 2778583, Japan 6.Univ Tokyo, Res Ctr Early Universe, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan 7.Embry Riddle Aeronaut Univ, 600 S Clyde Morris Blvd, Daytona Beach, FL 32114 USA
推荐引用方式 GB/T 7714	Zhao, J. K.,Zhao, G.,Aoki, W.,et al. Tracing the Origin of Moving Groups. II. Chemical Abundance of Six Stars in the Halo Stream LAMOST-N1[J]. ASTROPHYSICAL JOURNAL,2018,868(2):19.
APA	Zhao, J. K..,Zhao, G..,Aoki, W..,Ishigaki, M. N..,Suda, T..,...&Liang, X. L..(2018).Tracing the Origin of Moving Groups. II. Chemical Abundance of Six Stars in the Halo Stream LAMOST-N1.ASTROPHYSICAL JOURNAL,868(2),19.
MLA	Zhao, J. K.,et al."Tracing the Origin of Moving Groups. II. Chemical Abundance of Six Stars in the Halo Stream LAMOST-N1".ASTROPHYSICAL JOURNAL 868.2(2018):19.