Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...221..193h&link_type=abstract
Astrophysical Journal, Part 1, vol. 221, Apr. 1, 1978, p. 193-199.
Astronomy and Astrophysics
Astronomy
27
Eclipsing Binary Stars, Hot Stars, Infrared Astronomy, Stellar Atmospheres, Stellar Models, Stellar Winds, Wolf-Rayet Stars, Atmospheric Models, O Stars, Stellar Luminosity
Scientific paper
The density structure of the wind of the WN5 component of V444 Cyg is modeled by combining infrared eclipse observations of the free-free continuum with previous optical work. The results show that the wind expands at a nearly constant velocity at large continuum optical depths, in contrast with present theories of O-star winds driven by radiation pressure in lines. For a schematic envelope with a density gradient proportional to some inverse power of radial distance and an optical depth in electron scattering, the acceptable models have exponents of approximately -1.5 to -2 and scattering optical depths of about 0.75 to 1.5, in good agreement with the model of the WN5 star HD 50896 constructed by Hartmann and Cassinelli (1977). A plane-parallel coronal model is definitely ruled out.
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