Asteroseismology of sdB stars with FUSE

Details Asteroseismology of sdB stars with FUSE Asteroseismology of sdB stars with FUSE

2004-11-13

arxiv.org/abs/astro-ph/0411371v1

Astronomy and Astrophysics

Astrophysics

3 pages; 1 figure; proceeding; to appear in Astrophysics in the Far Ultraviolet, 2005, ASP Conference Series, eds. G. Sonnebor

Scientific paper

The hot subdwarf B (sdB) stars form an homogeneous group populating an extension of the horizontal branch (HB) in the ($T_{\rm eff}$--$\log g$) diagram towards temperatures up to 40,000 K. The recent discovery that many of them are multimode pulsators has triggered a large observational and theoretical effort. We discuss the possibility of performing space-based asteroseismology with {\em FUSE}, and we demonstrate that periodic luminosity variations are already detectable in archival TTAG data of sdB stars. In particular, we report on the {\em FUSE} observation of the pulsator PF 1219+534, which shows the presence of periodic variations at 6.9 mHz and 7.8 mHz, consistent with those reported from ground--based observations.

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