Radial Velocity Variable sdO/Bs from SPY - Preliminary Orbits of Three New Short Period Binaries

Geier, S., Heber, U. and Napiwotzki, R. (2008) Radial Velocity Variable sdO/Bs from SPY - Preliminary Orbits of Three New Short Period Binaries. In: In: Hot Subdwarf Stars and Related Objects - ASP Conf Series 392 :. Astronomical Society of the Pacific, pp. 225-230. ISBN 978-1-58381-654-7
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We present new results from follow-up time-resolved spectroscopy of radial velocity variable hot subdwarfs from the SPY project. Medium resolu- tion spectra were taken at the ESO NTT. Preliminary orbital solutions are presented for three single-lined sdO/B binaries. The orbital periods of all binaries are short and the companions are most likely white dwarfs or late main-sequence stars. Follow-up time-resolved spectroscopy is necessary to measure the orbital parameters with higher accuracy. Light curves should be taken in order to search for reflection effects and or eclipses.


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