SIMBAD references

2003A&A...402..335A - Astronomy and Astrophysics, volume 402, 335-342 (2003/4-4)

Physical parameters of helium-rich subdwarf B stars from medium resolution optical spectroscopy.

AHMAD A. and JEFFERY C.S.

Abstract (from CDS):

Most subdwarf B (sdB) stars have spectra that show helium (He) abundances depleted to a lesser or greater extent. This has been attributed to diffusion and gravitational settling. However a small but significant number of stars with similar temperatures and gravities show relatively strong helium spectra. The question is how these helium-rich sdB (He-sdB) stars are related to their He-deficient counterparts. We present physical parameters for sample of He-sdB stars using line-blanketed LTE models. From the analysis we show that the He-sdB stars are quite distinct from the He-poor sdB. We also explore the idea of a possible link between some extreme helium (EHe) stars and He-rich subdwarf O (He-sdO) stars.

Abstract Copyright: ∼

Journal keyword(s): stars: chemically peculiar - stars: early-type - subdwarfs - stars: atmospheres - stars: fundamental parameters

CDS comments: Table 1: HS 1000+471 is HS 1000+4704 in SIMBAD and HS 1844+637 is NAME HS 1844+637 in SIMBAD (because of the too short format). Paragr.4: D10763 = [MSL2002] J132535.57-472745.1 in SIMBAD.

Simbad objects: 23

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