Hot subdwarf stars from Gaia DR2 & LAMOST DR6+7. I. Virtual Observatory Resource

Authors
  1. Lei Z.
  2. Zhao J.
  3. Nemeth P.
  4. Zhao G.
  5. Published by
    CDS
Abstract

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 T_eff_-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+ (2017, J/A+A/600/A50) 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.

Keywords
  1. Subdwarf stars
  2. Chemical abundances
  3. Stellar spectral types
Bibliographic source Bibcode
2020ApJ...889..117L
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/889/117
IVOA Identifier IVOID
ivo://CDS.VizieR/J/ApJ/889/117
Document Object Identifer DOI
doi:10.26093/cds/vizier.18890117

Access

Web browser access HTML
http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/889/117
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/889/117
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/889/117
IVOA Table Access TAP
http://tapvizier.cds.unistra.fr/TAPVizieR/tap
Run SQL-like queries with TAP-enabled clients (e.g., TOPCAT).
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
http://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/889/117/table1?
https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/889/117/table1?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/889/117/table1?

History

2021-08-06T13:04:24Z
Resource record created
2021-08-06T13:04:24Z
Created
2022-07-08T07:06:09Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr