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New Hot Subdwarf Stars Identified in Gaia DR2 with LAMOST DR5 Spectra

文献类型：期刊论文

作者Lei, Zhenxin2,3; Zhao, Jingkun2; Nemeth, Peter1,4; Zhao, Gang2
刊名ASTROPHYSICAL JOURNAL
出版日期2018-11-20
卷号868期号:1页码:9
关键词Hertzsprung-Russell and C-M diagrams subdwarfs surveys
ISSN号0004-637X
DOI10.3847/1538-4357/aae82b
英文摘要We selected 4593 hot subdwarf candidates from the Gaia DR2 Hertzsprung-Russell (HR) diagram. By combining the sample with Large Sky Area Multi-Object Fibre Spectroscopic Telescope (LAMOST) DR5, we identified 294 hot subdwarf stars, including 169 sdB, 63 sdOB, 31 He-sdOB, 22 sdO, 7 He-sdO, and 2 He-sdB stars. The atmospheric parameters (e.g., T-eff, log g, log(nHe/nH)) are obtained by fitting the hydrogen (H) and helium (He) line profiles with synthetic spectra. Two distinct He sequences of hot subdwarf stars are clearly presented in the T-eff-log g diagram. We found that the He-rich sequence consists of the bulk of sdB and sdOB stars, as well as all of the He-sdB, He-sdO, and He-sdOB stars in our samples, while all the stars in the He-weak sequence belong to the sdO spectral type, combined with a few sdB and sdOB stars. We demonstrated that the combination of Gaia DR2 and LAMOST DR5 allows one to uncover a huge number of new hot subdwarf stars in our Galaxy.
WOS关键词POSSIBLE FORMATION CHANNEL ; BLUE HOOK STARS ; ULTRAVIOLET-RADIATION ; SUBLUMINOUS STARS ; GALEX SURVEY ; B-STARS ; ABUNDANCE ; SELECTION ; CATALOG ; ORIGIN
资助项目National Natural Science Foundation of China[11390371] ; National Natural Science Foundation of China[11503016] ; National Natural Science Foundation of China[11873037] ; National Natural Science Foundation of China[U1731111] ; Natural Science Foundation of Hunan province[2017JJ3283] ; Youth Fund project of Hunan Provincial Education Department[15B214] ; Grant Agency of the Czech Republic[GACR 18-20083S] ; National Development and Reform Commission ; Astronomical Big Data Joint Research Center ; Center for Astronomical Mega-Science, Chinese Academy of Sciences (CAMS)
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:000450931000005
出版者IOP PUBLISHING LTD
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; Natural Science Foundation of Hunan province ; Natural Science Foundation of Hunan province ; Youth Fund project of Hunan Provincial Education Department ; Youth Fund project of Hunan Provincial Education Department ; Grant Agency of the Czech Republic ; Grant Agency of the Czech Republic ; National Development and Reform Commission ; National Development and Reform Commission ; Astronomical Big Data Joint Research Center ; Astronomical Big Data Joint Research Center ; Center for Astronomical Mega-Science, Chinese Academy of Sciences (CAMS) ; Center for Astronomical Mega-Science, Chinese Academy of Sciences (CAMS) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Natural Science Foundation of Hunan province ; Natural Science Foundation of Hunan province ; Youth Fund project of Hunan Provincial Education Department ; Youth Fund project of Hunan Provincial Education Department ; Grant Agency of the Czech Republic ; Grant Agency of the Czech Republic ; National Development and Reform Commission ; National Development and Reform Commission ; Astronomical Big Data Joint Research Center ; Astronomical Big Data Joint Research Center ; Center for Astronomical Mega-Science, Chinese Academy of Sciences (CAMS) ; Center for Astronomical Mega-Science, Chinese Academy of Sciences (CAMS) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Natural Science Foundation of Hunan province ; Natural Science Foundation of Hunan province ; Youth Fund project of Hunan Provincial Education Department ; Youth Fund project of Hunan Provincial Education Department ; Grant Agency of the Czech Republic ; Grant Agency of the Czech Republic ; National Development and Reform Commission ; National Development and Reform Commission ; Astronomical Big Data Joint Research Center ; Astronomical Big Data Joint Research Center ; Center for Astronomical Mega-Science, Chinese Academy of Sciences (CAMS) ; Center for Astronomical Mega-Science, Chinese Academy of Sciences (CAMS) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Natural Science Foundation of Hunan province ; Natural Science Foundation of Hunan province ; Youth Fund project of Hunan Provincial Education Department ; Youth Fund project of Hunan Provincial Education Department ; Grant Agency of the Czech Republic ; Grant Agency of the Czech Republic ; National Development and Reform Commission ; National Development and Reform Commission ; Astronomical Big Data Joint Research Center ; Astronomical Big Data Joint Research Center ; Center for Astronomical Mega-Science, Chinese Academy of Sciences (CAMS) ; Center for Astronomical Mega-Science, Chinese Academy of Sciences (CAMS)
源URL[http://ir.bao.ac.cn/handle/114a11/23615]  
专题中国科学院国家天文台
通讯作者Lei, Zhenxin
作者单位1.Astroserver Org, H-8533 Malomsok, Hungary
2.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100012, Peoples R China
3.Shaoyang Univ, Coll Sci, Shaoyang 422000, Peoples R China
4.Czech Acad Sci, Astron Inst, CZ-25165 Ondrejov, Czech Republic
推荐引用方式
GB/T 7714		 Lei, Zhenxin,Zhao, Jingkun,Nemeth, Peter,et al. New Hot Subdwarf Stars Identified in Gaia DR2 with LAMOST DR5 Spectra[J]. ASTROPHYSICAL JOURNAL,2018,868(1):9.
APA Lei, Zhenxin,Zhao, Jingkun,Nemeth, Peter,&Zhao, Gang.(2018).New Hot Subdwarf Stars Identified in Gaia DR2 with LAMOST DR5 Spectra.ASTROPHYSICAL JOURNAL,868(1),9.
MLA Lei, Zhenxin,et al."New Hot Subdwarf Stars Identified in Gaia DR2 with LAMOST DR5 Spectra".ASTROPHYSICAL JOURNAL 868.1(2018):9.

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