par Naslim, N.;Jeffery, Simon;Ahmad, Ajaz;Behara, Natalie Thérèse ;Sahìn, Timur
Référence Astrophysics and space science, 329, 1, page (119-125)
Publication Publié, 2010
Article révisé par les pairs
Résumé : 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. © 2010 Springer Science+Business Media B.V.

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