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        Stellar Wind Signatures in sdB Stars

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        901636.pdf (PDF, 298Kb)
        Author
        Heber, U.
        Maxted, P.F.L.
        Marsh, T.R.
        Knigge, C.
        Drew, J.E.
        Attention
        2299/1471
        Abstract
        Subdwarf B (sdB) stars form the blue end of the horizontal branch. Their peculiar atmospheric-abundance patters result from diffusion processes. However, diffusion models fail to explain these anomalies quantitatively. From a NLTE model-atmosphere analysis of 40 sdB stars, we found that the more luminous (i.e. more evolved) stars have anomalous Ha and He I6678A line profiles, i.e. the lines are too broad and shallow, and may even show some emission. We interpret these anomalies as the signatures of a stellar wind, the first such detection in this class of star (if confirmed). Mass-loss may also explain the peculiar abundance patterns see in sdB stars. High-quality UV spectra are needed to confirm that these stars do have stellar winds.
        Publication date
        2003
        Published in
        In: Procs of Stellar Atmosphere Modeling, ASP Conference Proceedings 288
        Other links
        http://hdl.handle.net/2299/1471
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