Abundance analyses of three helium-rich sdB stars

N. Naslim, C. S. Jeffery, A. Ahmad, N. Behara, T. Şahìn

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Pages (from-to)119-125
Number of pages7
JournalAstrophysics and Space Science
Issue number1
Publication statusPublished - 2010
Externally publishedYes


  • Abundances
  • Atmospheric parameters
  • Evolution
  • Helium-rich subdwarfs

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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