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Spectroscopic analysis of sdB stars from the ESO Supernova Ia Progenitor Survey
- Source :
- Astrophysics and Space Science. 291:351-358
- Publication Year :
- 2004
- Publisher :
- Springer Science and Business Media LLC, 2004.
-
Abstract
- We report on the analysis of high-resolution optical spectra for 77 subdwarf B (sdB) stars from the ESO Supernova Ia Progenitor Survey. Effective temperature, surface gravity, and photospheric helium abundance are determined simultaneously by spectral line profile fitting of hydrogen and helium lines, and are found to be in agreement with previous studies of sdB stars. 24 objects show spectral signs of a cool companion, being either companion absorption lines or a flux contribution at Halpha. Five stars with relatively high luminosity show peculiar Halpha profiles, possibly indicating stellar winds. Our results are compared to recent theoretical simulations by Han et al. (2003) for the distribution in effective temperature and surface gravity, and are found to agree very well with these calculations. Finally we present a binary system consisting of two helium-rich hot subdwarfs.<br />Comment: 8 pages, 6 figures. To appear in "Extreme Horizontal Branch Stars and Related Objects", Astrophysics and Space Science, Kluwer Academic Publishers, edited by P. F. L. Maxted
- Subjects :
- Physics
Astrophysics (astro-ph)
FOS: Physical sciences
Flux
Astronomy and Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
Astrophysics
Effective temperature
Surface gravity
Subdwarf
Spectral line
Luminosity
Supernova
Stars
Space and Planetary Science
Astrophysics::Solar and Stellar Astrophysics
Astrophysics::Earth and Planetary Astrophysics
Astrophysics::Galaxy Astrophysics
Subjects
Details
- ISSN :
- 0004640X
- Volume :
- 291
- Database :
- OpenAIRE
- Journal :
- Astrophysics and Space Science
- Accession number :
- edsair.doi.dedup.....59dd372af708e2d0a187068e38b04aad