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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Napiwotzki, R., Karl, C., Lisker, T. et al. Close binary EHB stars from SPY. Astrophys Space Sci 291, 321–328 (2004). https://doi.org/10.1023/B:ASTR.0000044362.07416.6c
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DOI: https://doi.org/10.1023/B:ASTR.0000044362.07416.6c