SIMBAD references

2020ApJ...889..117L - Astrophys. J., 889, 117-117 (2020/February-1)

Hot subdwarf stars identified in Gaia DR2 with spectra of LAMOST DR6 and DR7. I. Single-lined spectra.


Abstract (from CDS):

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-log(nHe/nH) 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.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Subdwarf stars - Stellar classification - Surveys

VizieR on-line data: <Available at CDS (J/ApJ/889/117): table1.dat>

Simbad objects: 183

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