A Catalog of OB Stars from LAMOST Spectroscopic Survey

doi:10.3847/1538-4365/ab0a0d

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	A Catalog of OB Stars from LAMOST Spectroscopic Survey
	Liu,Zhicun 2,3; Cui,Wenyuan 2; Liu,Chao 3; Huang,Yang 1; Zhao,Gang 3; Zhang,Bo 2
刊名	The Astrophysical Journal Supplement Series
	2019-04-12
卷号	241 期号:2
关键词	catalogs stars: early-type stars: fundamental parameters surveys
ISSN号	0067-0049
DOI	10.3847/1538-4365/ab0a0d
英文摘要	Abstract We present 22,901 OB spectra of 16,032 stars identified from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope data release 5 data set. A larger sample of OB candidates are first selected from the distributions in the spectral line indices’ space. Then, all 22,901 OB spectra are identified by manual inspection. Based on a subsample validation, we find that the completeness of the OB spectra reaches about 89?±?22% for the stars with spectral types earlier than B7, while around 57?±?16% B8–B9 stars are identified. The smaller completeness for late B stars will lead to the difficulty in discriminating them from A0–A1-type stars. The subclasses of the OB samples are determined using the software package MKCLASS. With a careful validation using 646 subsamples, we find that MKCLASS can give fairly reliable subtypes and luminosity classes for most of the OB stars. The uncertainty of the spectral subtype is around 1 subtype, and the uncertainty of the luminosity class is around 1 level. However, about 40% of the OB stars fail to be assigned to any class by MKCLASS, and a few spectra are significantly misclassified by MKCLASS. This is likely because the template spectra of MKCLASS are selected from nearby stars in the solar neighborhood, while the OB stars in this work are mostly located in the outer disk and may have lower metallicities. The rotation of the OB stars may also be responsible for the misclassifications. Moreover, we find that the spectral and luminosity classes of the OB stars located in the Galactic latitude larger than 20° are substantially different with those located in the latitude smaller than 20°, which may either be due to the observational selection effect or may hint a different origin of the high Galactic latitude OB stars.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:0067-0049-241-2-AB0A0D
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/25976]
专题	中国科学院国家天文台
作者单位	1.South-Western Institute for Astronomy Research, Yunnan University, Kunming 650500, People’s Republic of China 2.Department of Physics, Hebei Normal University, Shijiazhuang 050024, People’s Republic of China; wenyuancui@126.com 3.Key Lab of Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People’s Republic of China; liuchao@nao.cas.cn
推荐引用方式 GB/T 7714	Liu,Zhicun,Cui,Wenyuan,Liu,Chao,et al. A Catalog of OB Stars from LAMOST Spectroscopic Survey[J]. The Astrophysical Journal Supplement Series,2019,241(2).
APA	Liu,Zhicun,Cui,Wenyuan,Liu,Chao,Huang,Yang,Zhao,Gang,&Zhang,Bo.(2019).A Catalog of OB Stars from LAMOST Spectroscopic Survey.The Astrophysical Journal Supplement Series,241(2).
MLA	Liu,Zhicun,et al."A Catalog of OB Stars from LAMOST Spectroscopic Survey".The Astrophysical Journal Supplement Series 241.2(2019).