Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988pasp..100.1256u&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 100, Oct. 1988, p. 1256-1268. NSERC-supported research.
Astronomy and Astrophysics
Astronomy
13
Eclipsing Binary Stars, O Stars, Visible Spectrum, Wolf-Rayet Stars, Absorption Spectra, Emission Spectra, Spectral Line Width, Stellar Spectrophotometry
Scientific paper
The authors present profiles of the emission lines visible on yellow-green spectra of V444 Cyg and profiles of the O-star absorption line O III λ5592. They measure the equivalent widths of the emission features and show how the strength varies with phase in the photometric period. What the observations show cannot be interpreted in terms of an O star close to a Wolf-Rayet star which has a steady, dense spherical wind. The O star and the Wolf-Rayet star may lie inside of a large, low-density inhomogeneous disk which is in the orbital plane. The line-emitting parts of the disk move with the Wolf-Rayet star. The optical depth in electron scattering of this disk is too small to broaden by a detectable amount the profile of the O-star absorption line which appears on the spectra. Nevertheless, the disk radiates a significant amount of energy in lines of the abundant ion He+. Infall appears to take place from the disk to the Wolf-Rayet star.
Hill Grant Michael
Underhill Anne. B.
Yang Sheng
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