Abundance analyses of three helium-rich sdB stars

Details Abundance analyses of three helium-rich sdB stars Abundance analyses of three helium-rich sdB stars

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010ap%26ss.329..119n&link_type=abstract

Astrophysics and Space Science, Volume 329, Issue 1-2, pp. 119-125

Astronomy and Astrophysics

Astrophysics

Helium-Rich Subdwarfs, Atmospheric Parameters, Abundances, Evolution

Scientific paper

As part of an extended study of the surface abundances of extremely helium-rich hot subdwarfs, high-resolution optical échelle spectra of the three helium-rich subdwarf B stars LB 1766, SB 21 and BPS 22940-0009 are presented. Opacity-sampled line-blanketed model atmospheres have been used to derive atmospheric properties and surface abundances. All three stars are moderately metal-poor compared with the Sun ([Fe/H]≈-0.4). The first two stars are nitrogen-rich He-sdBs, while the third is a carbon-rich He-sdB. The surface composition and locus of single N-rich He-sdBs are currently best explained by the merger of two helium white dwarfs. C-rich He-sdBs require further investigation.

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