Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...281..774c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 281, June 15, 1984, p. 774-788.
Astronomy and Astrophysics
Astronomy
149
Eclipsing Binary Stars, Light Curve, Spaceborne Astronomy, Stellar Spectrophotometry, Ultraviolet Photometry, Wolf-Rayet Stars, Astronomical Photometry, Brightness Distribution, Stellar Atmospheres, Stellar Spectra, Ultraviolet Astronomy
Scientific paper
The structure of the expanding atmosphere and the physical characteristics of the WN5 component of V444 Cyg have been determined from an analysis of light curves for the wavelength range 2460 Å - 3.5 μm. The radius of the WN5 star's core is r0 = 2.9 R_sun;; the temperature at its surface is ≡90,000K. A detailed analysis of the distribution of density, temperature and outflow velocity in the expanding atmosphere of this star is presented. The results agree best with the Beals model of Wolf-Rayet atmospheres in which the radial expansion is caused by a high radiation pressure gradient and the temperature structure is determined primarily by radiative transfer. The physical characteristics of the binary system and of the Wolf-Rayet component are consistent with theoretical predictions of the evolution of massive close binary systems with mass loss and mass exchange. The W-R component is in a post-main-sequence evolutionary stage, being a helium remnant formed as the result of case B mass exchange.
Cherepashchuk Anatol M.
Eaton Joel A.
Khaliullin Kh. F.
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