Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....47..429w&link_type=abstract
Astronomy and Astrophysics, vol. 47, no. 3, Mar. 1976, p. 429-436.
Astronomy and Astrophysics
Astronomy
33
Satellite Observation, Spaceborne Astronomy, Stellar Spectra, Ultraviolet Spectra, Astronomical Spectroscopy, Eclipses, Sky Surveys (Astronomy), Stellar Winds, Td-1 Satellite, Wolf-Rayet Stars
Scientific paper
Ultraviolet observations of Gamma-2 Velorum (WC8 + O9 I) made with the sky-survey telescope in the TD-1A satellite at two orbital phases are presented. The observed spectra are described and compared with other UV observations of the system. The UV brightness ratio of the two components is determined with the result that the O9 I component is the brighter by between 1.4 and 1.8 mag. The spectrum of the WC8 component is estimated and shown to agree well with the UV spectrum observed for a single WC8 star, HD 192103. Considerable variations are observed in the UV spectra of Gamma-2 Velorum and are interpreted in terms of an eclipse of the O9 I component by the stellar wind from the expanding WC8 envelope. An estimate of the mass loss from the WC8 component is derived, but its accuracy is severely limited by the uncertainty of the carbon abundance in the Wolf-Rayet component.
Willis Alan J.
Wilson Raymond
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