Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975rspta.279..451v&link_type=abstract
(Royal Society, Discussion on Astronomy in the Ultraviolet, London, England, Apr. 9, 10, 1974.) Royal Society (London), Philosop
Astronomy and Astrophysics
Astronomy
4
Binary Stars, Continuous Spectra, Hot Stars, Spectral Energy Distribution, Stellar Spectra, Ultraviolet Spectra, Wolf-Rayet Stars, Astronomical Models, Helium, Near Ultraviolet Radiation, O Stars, Stellar Luminosity
Scientific paper
Near-UV absorption spectra of the WC and blue-supergiant components of gamma-2 Vel are analyzed, particularly the regions centered on 2100 and 2500 A. Each of the two components is found to contribute about 50% of the total observed continuum flux in the two spectral regions. Normalized fluxes are estimated for each star and compared with theoretical values based on geometrically extended model atmospheres. It is shown that the near-UV flux from the blue supergiant is in agreement with the model calculations, but the flux from the WC star is about one magnitude higher than can be accounted for by the hottest models of Wolf-Rayet stars. It is suggested that this enhanced flux may be due to a high helium abundance in the atmospheres of Wolf-Rayet stars.
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