Stellar wind signatures in sdB stars?

U. Heber (1) , P.F.L. Maxted (2) , T.R. Marsh (3) , C. Knigge (3) , J E. Drew (4) (1 Dr. Remeis-Sternwarte , Universitaet Erlangen-Nuernberg , Bamberg , Germany) (2 School of Chemistry & Physics

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Keele University GB) (3 University of Southampton Dept. of Physics & Astronomy GB) (4 Imperial College London GB)

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classification 🌌 astro-ph

keywords starsbeendiffusionstellarabundanceanalysisanomaliesatmosphere

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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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Stellar wind signatures in sdB stars?

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