Spectroscopic Analyses of Helium-rich Subdwarf B Stars

Details Spectroscopic Analyses of Helium-rich Subdwarf B Stars Spectroscopic Analyses of Helium-rich Subdwarf B Stars

Jul 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..334..291a&link_type=abstract

14th European Workshop on White Dwarfs, ASP Conference Series, Vol. 334 Proceedings of a meeting held at Kiel, July 19-23, 2004

Astronomy and Astrophysics

Astronomy

1

Scientific paper

Helium-rich subdwarf B (He-sdB) stars form a very small fraction of all hot subdwarfs. They have been found both in the field of our galaxy as well as in globular clusters. The evolution of these rare stars has recently been the subject of much debate involving both binary and single star evolution models. We present new measurements of the atmospheric parameters of several He-sdB stars which demonstrate that they form a very inhomogeneous group. In particular, we discuss the discovery that PG 1544+488 is a short-period spectroscopic binary containing two helium-rich subdwarfs. We also discuss the contradiction between FUSE and optical measurements of He-sdB surface gravities and the implications of these observations for the evolutionary status of He-sdB stars are also explored.

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