Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...210...93l&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 210, no. 1-2, Feb. 1989, p. 93-113.
Astronomy and Astrophysics
Astrophysics
157
Stellar Models, Stellar Structure, Wolf-Rayet Stars, Abundance, Chemical Composition, Mass To Light Ratios, Stellar Evolution, Stellar Mass, Surface Temperature
Scientific paper
A set of stellar models representing all kinds of WR stars except those of subtype WNL, covering the whole range of realistic stellar masses and chemical compositions, was constructed, and the influence of the exotic chemical composition on the internal structure and observable properties of the stars was investigated in detail. It is demonstrated that all observable properties of WR stars are entirely determined by their mass and surface chemical composition. A one-to-one correspondence of WNE subtypes and WNE mass intervals is predicted, and a very accurate mass-luminosity relation is derived for WNE type stars. It is predicted that all Galactic WNE stars should be located on one line in the HR diagram. No single mass-luminosity relation exists for WC/WO stars. It is shown that the surface helium mass fraction and the stellar mass determine all observable properties of three stars. Accurate fits of luminosity and core radius as a function of these two parameters are derived.
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