LTE model atmospheres for hot, helium-rich degenerate stars

Details LTE model atmospheres for hot, helium-rich degenerate stars LTE model atmospheres for hot, helium-rich degenerate stars

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.243..182b&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 243, March 15, 1990, p. 182-191.

Astronomy and Astrophysics

Astronomy

11

Astronomical Models, B Stars, Hot Stars, Stellar Atmospheres, Thermodynamic Equilibrium, Abundance, Exosat Satellite, Helium, Stellar Composition, Stellar Gravitation, X Rays

Scientific paper

Exosat soft-X-ray observations of He-rich degenerates are presently analyzed in view of a grid of hot, high-gravity LTE model atmospheres in the 50,000-200,000 K range; these calculations encompass H, He, C, N, and O opacity sources in order to span a uniquely broad range of compositions by comparison with earlier efforts. Emergent fluxes are presented for all calculated models, and attention is given to the effects of surface gravity and composition. Several of the models are compared with published calculations to both verify the code employed and evaluate the importance of non-LTE effects on the emergent soft X-ray fluxes at high temperatures and gravities.

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