Hot subdwarf stars from Gaia DR2 and LAMOST DR5 Virtual Observatory Resource

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

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., Teff, logg, 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 Teff-logg 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.

Keywords
  1. Subdwarf stars
  2. Astronomical object identification
  3. Chemical abundances
  4. Radial velocity
  5. Optical astronomy
  6. Narrow band photometry
  7. Stellar spectral types
Bibliographic source Bibcode
2018ApJ...868...70L
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/868/70
IVOA Identifier IVOID
ivo://CDS.VizieR/J/ApJ/868/70
Document Object Identifer DOI
doi:10.26093/cds/vizier.18680070

Access

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http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/868/70
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http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/868/70
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https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/868/70/table1?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/868/70/table1?

History

2019-11-20T14:45:20Z
Resource record created
2019-11-20T14:45:20Z
Created
2020-03-26T14:17:07Z
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