Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-10-28
Astrophys.Space Sci. 291 (2004) 351-358
Astronomy and Astrophysics
Astrophysics
8 pages, 6 figures. To appear in "Extreme Horizontal Branch Stars and Related Objects", Astrophysics and Space Science, Kluwer
Scientific paper
10.1023/B:ASTR.0000044343.94946.
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.
Christlieb Nn.
Heber Uli
Homeier Derek
Lisker Thorsten
Napiwotzki Ralf
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