Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...402..335a&link_type=abstract
Astronomy and Astrophysics, v.402, p.335-342 (2003)
Astronomy and Astrophysics
Astrophysics
30
Stars: Chemically Peculiar, Stars: Early-Type, Subdwarfs, Stars: Atmospheres, Stars: Fundamental Parameters
Scientific paper
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.
Based on observations made with the William Herschel and Isaac Newton Telescopes operated on the island of La Palma by the Isaac Newton Group in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias.
Ahmad Ayesha
Jeffery Simon C.
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