SIMBAD references

2018ApJ...868...70L - Astrophys. J., 868, 70-70 (2018/November-3)

New hot subdwarf stars identified in Gaia DR2 with LAMOST DR5 spectra.


Abstract (from CDS):

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, log g, 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-log g 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.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): Hertzsprung-Russell and C-M diagrams - subdwarfs - surveys

VizieR on-line data: <Available at CDS (J/ApJ/868/70): table1.dat>

Simbad objects: 294

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