Stellar wind signatures in sdB stars?

Details Stellar wind signatures in sdB stars? Stellar wind signatures in sdB stars?

2002-12-20

arxiv.org/abs/astro-ph/0212488v1

Astronomy and Astrophysics

Astrophysics

2 pages, 1 figure, Proc. XIII Workshop on White Dwarfs, eds. D. de Martino, R. Kalytis, R. Silvotti, J.E. Solheim, Kluwer

Scientific paper

Subdwarf B (sdB) stars form the blue end of the horizonal branch (EHB). Their peculiar atmospheric abundance patterns are due to diffusion processes. However, diffusion models fail to explain these anomalies quantitatively. Weak mass loss has been invoked to solve these discrepancies, but up to now has not been observed. We report first observational evidence for stellar winds in four sdB stars from a NLTE model atmosphere analysis of high quality optical spectra.

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