A Catalog of 10,000 Very Metal-poor Stars from LAMOST DR3

doi:10.3847/1538-4365/aada4a

CORC > 国家天文台 > 中国科学院国家天文台

	A Catalog of 10,000 Very Metal-poor Stars from LAMOST DR3
	Li, Haining 1; Tan, Kefeng 1; Zhao, Gang 1,2
刊名	ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
	2018-10-01
卷号	238 期号:2 页码:10
关键词	catalogs methods: data analysis stars: Population II surveys
ISSN号	0067-0049
DOI	10.3847/1538-4365/aada4a
英文摘要	We present the result of a search for very metal-poor (VMP, [Fe/H] < -2.0) stars in the Milky Way based on low-resolution spectra from Large sky Area Multi-Object fiber Spectroscopic Telescope (LAMOST) DR3, significantly enlarging the current candidate sample of these low-metallicity objects. The selection procedure results in a sample of 10,008 VMP stars covering a large area of sky in the Northern Hemisphere, and includes over 6800 targets brighter than V similar to 16. This LAMOST DR3 VMP sample provides the largest number of VMP candidates to date that are sufficiently bright for follow-up high-resolution observation with 4-10 m telescopes, greatly expanding the VMP stars discovered in the northern sky, and can be used to balance the spatial distribution of VMP stars with high-resolution spectroscopic analyses. Comparison with stars having existing high-resolution analyses and Tycho Gaia Astrometric Solution parallaxes indicates that the derived stellar parameters and distance estimates are reliable. The sample reaches beyond 40 kpc in the halo, and contains over 670 candidates of extremely metal-poor ([Fe/H] < -3.0) and ultra-metal-poor ([Fe/H] < -4.0) stars. The distribution of V-phi indicates that the sample consists of two halo components, with the retrograde component likely to be associated with the outer-halo population. A new criterion is proposed to select carbon-enhanced metal-poor (CEMP) star candidates, using line indices G1 and EGP over the range 4000 K < T-eff < 7000 K, resulting in 636 CEMP candidates from the LAMOST DR3 VMP sample.
资助项目	NSFC[11390371] ; NSFC[11573032] ; NSFC[11673030] ; National Development and Reform Commission
WOS关键词	HIGH-DISPERSION-SPECTROGRAPH ; GALACTIC CHEMICAL EVOLUTION ; SKY SURVEY 2MASS ; MILKY-WAY ; HAMBURG/ESO SURVEY ; HALO STARS ; SPECTROSCOPIC SURVEY ; ABUNDANCE ANALYSIS ; EARLY GALAXY ; DWARF STARS
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000445893900001
资助机构	NSFC ; NSFC ; National Development and Reform Commission ; National Development and Reform Commission ; NSFC ; NSFC ; National Development and Reform Commission ; National Development and Reform Commission ; NSFC ; NSFC ; National Development and Reform Commission ; National Development and Reform Commission ; 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/114a11/22890]
专题	中国科学院国家天文台
通讯作者	Li, Haining
作者单位	1.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, A20 Datun Rd, Beijing 100102, Peoples R China 2.Univ Chinese Acad Sci, Sch Astron & Space Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Li, Haining,Tan, Kefeng,Zhao, Gang. A Catalog of 10,000 Very Metal-poor Stars from LAMOST DR3[J]. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,2018,238(2):10.
APA	Li, Haining,Tan, Kefeng,&Zhao, Gang.(2018).A Catalog of 10,000 Very Metal-poor Stars from LAMOST DR3.ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES,238(2),10.
MLA	Li, Haining,et al."A Catalog of 10,000 Very Metal-poor Stars from LAMOST DR3".ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES 238.2(2018):10.