Close binary EHB stars from SPY: Extreme Horizontal Branch Stars and Related Objects (Guest Editor: P.F.L. Maxted)

Authors: Napiwotzki, R.¹; Karl, C.A.²; Lisker, T.²; Heber, U.²; Christlieb, N.³; Reimers, D.³; Nelemans, G.⁴; Homeier, D.⁵

Source: Astrophysics and Space Science, Volume 291, Number 3, 2004 , pp. 321-328(8)

Publisher: Springer

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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: stars:; horizontal branch; stars:; evolution; stars:; binaries

Document Type: Research article

DOI: http://dx.doi.org/10.1023/B:ASTR.0000044362.07416.6c

Affiliations: 1: Dr. Remeis-Sternwarte, Universität Erlangen-Nürnberg, Bamberg, Germany., Email: rn38@astro.le.ac.uk 2: Dr. Remeis-Sternwarte, Universität Erlangen-Nürnberg, Bamberg, Germany 3: Hamburger Sternwarte, Universität Hamburg, Hamburg, Germany 4: Institute of Astronomy, University of Cambridge, Cambridge, UK 5: Department of Physics & Astronomy, University of Georgia, Athens, USA

Publication date: 2004-01-01