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

文献类型：期刊论文

作者Li, Haining1; Tan, Kefeng1; Zhao, Gang1,2
刊名ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
出版日期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
DOI10.3847/1538-4365/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.
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
资助项目NSFC[11390371] ; NSFC[11573032] ; NSFC[11673030] ; National Development and Reform Commission
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:000445893900001
出版者IOP PUBLISHING LTD
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
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.

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