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Hot Subdwarf Stars Identified in Gaia DR2 with Spectra of LAMOST DR6 and DR7. I. Single-lined Spectra
Lei,Zhenxin1,2; Zhao,Jingkun2; Németh,Péter3,4; Zhao,Gang2
2020-01-30
Source PublicationThe Astrophysical Journal
ISSN0004-637X
Volume889Issue:2
AbstractAbstract 182 single-lined hot subdwarf stars are identified by using spectra from the sixth and seventh data releases (DR6 and DR7) of the Large Sky Area Multi-Object Fibre Spectroscopic Telescope survey. We classified all the hot subdwarf stars using a canonical classification scheme, and got 89 sdB, 37 sdOB, 26 sdO, 24 He-sdOB, 3 He-sdO, and 3 He-sdB stars, respectively. Among these stars, 108 hot subdwarfs are newly discovered, while 74 stars were reported by previous catalogs. The atmospheric parameters of these stars were obtained by fitting the hydrogen (H) and helium (He) lines with non-local thermodynamic equilibrium model atmospheres. The atmospheric parameters confirm the two He sequences and the two subgroups of He-sdOB stars in our samples, which were found by previous studies in the Teff– diagram. Our results demonstrate different origins of field hot subdwarf stars and extreme horizontal branch stars in globular clusters, and provide strict observational limits on the formation and evolution models of the different sub-types of these evolved objects. Based on the results, we evaluated the completeness of the Geier et al. catalog. We found the fraction of hot subwarf stars is between 10% and 60%, depending on the brightness of the sample. A more accurate estimation for the hot subdwarf fraction can be obtained when similar results from composite spectra will become available.
KeywordSubdwarf stars Stellar classification Surveys
DOI10.3847/1538-4357/ab660a
Language英语
WOS IDIOP:0004-637X-889-2-ab660a
PublisherThe American Astronomical Society
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/28519
Collection中国科学院国家天文台
Affiliation1.Physics Department, Xiangtan University, Xiangtan 411105, People’s Republic of China
2.Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People’s Republic of China zxlei@nao.cas.cn, gzhao@nao.cas.cn
3.Astronomical Institute of the Czech Academy of Sciences, CZ-251 65, Ond?ejov, Czech Republic
4.Astroserver.org, 8533 Malomsok, Hungary
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Lei,Zhenxin,Zhao,Jingkun,Németh,Péter,et al. Hot Subdwarf Stars Identified in Gaia DR2 with Spectra of LAMOST DR6 and DR7. I. Single-lined Spectra[J]. The Astrophysical Journal,2020,889(2).
APA Lei,Zhenxin,Zhao,Jingkun,Németh,Péter,&Zhao,Gang.(2020).Hot Subdwarf Stars Identified in Gaia DR2 with Spectra of LAMOST DR6 and DR7. I. Single-lined Spectra.The Astrophysical Journal,889(2).
MLA Lei,Zhenxin,et al."Hot Subdwarf Stars Identified in Gaia DR2 with Spectra of LAMOST DR6 and DR7. I. Single-lined Spectra".The Astrophysical Journal 889.2(2020).
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