We present new results from follow-up time-resolved spectroscopy of radial velocity variable hot subdwarfs from the SPY project. Medium resolution 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.
@article{arxiv.0804.1276,
title = {Radial Velocity Variable sdO/Bs from SPY - Preliminary Orbits of Three New Short Period Binaries},
author = {S. Geier and U. Heber and R. Napiwotzki},
journal= {arXiv preprint arXiv:0804.1276},
year = {2008}
}