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Interpretation of eclipses at emission-line frequencies in Wolf-Rayet binaries

Journal Article · · Sov. Astron. AJ (Engl. Transl.); (United States)
OSTI ID:7335486
;
A method is developed for interpreting eclipses observed at the frequencies of emission lines in binary systems containing WR components. The anisotropy of the selective-absorption coefficient in the WR envelope is taken into account. The spatial structure of the WR envelope can be investigated, even the outermost parts. From observed intensities of the lambda4686 He II emission line in the V444 Cyg system and the lambda4653 C II--C IV, N III emission feature in CV Ser, the distribution of the volume selective-absorption coefficient in the WR envelope is determined for specified velocity fields. The cases of accelerated, uniform, and retarded expansion are considered. The population of the 3D level of the He II ion in the inner layers of a WR envelope undisturbed by the companion star is described by the law n/sub 3//sub D/(r) approx. =3900 (r/sub 0//r)/sup 3/, where r/sub 0/=2.6 R/sub sun/. If r/r/sub 0/=3, n/sub 3//sub D/=150 cm/sup -3/. The ratio n/sub e//n/sub 3//sub D/approx. =4 x 10/sup 9/ in the WR envelope, depending little on the distance r. This method uniquely determines both the spatial structure and the velocity field of the WR envelope from an analysis of the intensities and profiles of emission lines during selective atmospheric eclipses when the WR envelope occults the companion. (AIP)
Research Organization:
Shternberg Astronomical Institute, Moscow
OSTI ID:
7335486
Journal Information:
Sov. Astron. AJ (Engl. Transl.); (United States), Journal Name: Sov. Astron. AJ (Engl. Transl.); (United States) Vol. 20:2; ISSN SAAJA
Country of Publication:
United States
Language:
English

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Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ATMOSPHERES
BINARY STARS
CHEMICAL COMPOSITION
ECLIPSE
EMISSION SPECTRA
ENERGY-LEVEL TRANSITIONS
SPECTRA
STARS
STELLAR ATMOSPHERES
WOLF-RAYET STARS