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Paper: Spectroscopic Analyses of Helium-rich Subdwarf B Stars
Volume: 334, 14th European Workshop on White Dwarfs
Page: 291
Authors: Ahmad, A.; Jeffery, C.S.
Abstract: 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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