Close binary EHB stars from SPY
Astrophysics
2009-11-10 v1
Abstract
We present the results of a radial velocity (RV) survey of 46 subdwarf B (sdB) and 23 helium-rich subdwarf O (He-sdO) stars. We detected 18 (39%) new sdB binary systems, but only one (4%) He-sdO binary. Orbital parameters of nine sdB and sdO binaries, derived from follow-up spectroscopy, are presented. Our results are compared with evolutionary scenarios and previous observational investigations.
Keywords
Cite
@article{arxiv.astro-ph/0401201,
title = {Close binary EHB stars from SPY},
author = {R. Napiwotzki and C. A. Karl and T. Lisker and U. Heber and N. Christlieb and D. Reimers and G. Nelemans and D. Homeier},
journal= {arXiv preprint arXiv:astro-ph/0401201},
year = {2009}
}
Comments
To appear in "Extreme Horizontal Branch Stars and Related Objects", Astrophysics and Space Science, Kluver Academic Publishers, edited by P.F.L. Maxted