Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....87l...7s&link_type=abstract
Astronomy and Astrophysics, vol. 87, no. 3, July 1980, p. L7-L9.
Astronomy and Astrophysics
Astrophysics
20
Atmospheric Composition, Coronas, Hot Stars, Stellar Atmospheres, Stellar Envelopes, Wolf-Rayet Stars, Absorption Spectra, Chemical Composition, H Lines, Photosphere, Spectrum Analysis, Stellar Spectra
Scientific paper
It is suggested that the Wolf-Rayet stars are not H-deficient objects, that they probably have a normal chemical composition but that the Balmer lines are not observed because the physical conditions of the extended envelopes of the Wolf-Rayet stars are such that the photospheric lines cannot be seen - except apparently in late WNs - nor are H lines formed in the layers of the extended envelope that can be investigated in the conventional region of the spectrum. It is further suggested that the extended envelope in a Wolf-Rayet star is a sort of stellar corona with two regions of maximum electron temperature and that the transition zone with the photosphere, if any, must be extremely narrow.
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