The Chemical Composition of Helium-rich sdB Stars

Details The Chemical Composition of Helium-rich sdB Stars The Chemical Composition of Helium-rich sdB Stars

Mar 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aspc..452...65n&link_type=abstract

Fifth Meeting on Hot Subdwarf Stars and Related Objects, ASP Conference Series Vol. 452, proceedings of a workshop held at Stell

Astronomy and Astrophysics

Astronomy

Scientific paper

We present abundance analyses of He-sdB stars using high resolution optical spectra obtained with AAT/UCLES. Our aim is to explore the connection between He-sdB stars, He-sdO stars and normal sdB stars. Opacity-sampled line-blanketed model atmospheres have been used to derive atmospheric properties and elemental abundances. Our studies clearly distinguish intermediate He-sdB stars from extreme He-sdB stars. Intermediate He-sdB stars mostly exhibit strong unusual elemental abundances. The most likely explanation for this abundance anomaly is radiatively-driven diffusion in the photosphere.

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