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Close binary EHB stars from SPY |
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| Authors: | R Napiwotzki CA Karl T Lisker U Heber N Christlieb D Reimers G Nelemans D Homeier |
| Institution: | 1. Dr. Remeis-Sternwarte, Universit?t Erlangen-Nürnberg, Bamberg, Germany 2. Hamburger Sternwarte, Universit?t Hamburg, Hamburg, Germany 3. Institute of Astronomy, University of Cambridge, Cambridge, UK 4. Department of Physics & Astronomy, University of Georgia, Athens, USA |
| 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. |
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