Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981rmxaa...6..189s&link_type=abstract
(International Astronomical Union, Reunion Regional Latinoamericana de Astronomia, 2nd, Merida, Venezuela, Jan. 19-23, 1981) Rev
Astronomy and Astrophysics
Astronomy
4
Binary Stars, Chemical Composition, Stellar Evolution, Wolf-Rayet Stars, Absorption Spectra, Emission Spectra, Magellanic Clouds, Nebulae, Red Giant Stars, Star Clusters, Stellar Spectra, Supergiant Stars
Scientific paper
Aspects of the problems of the Wolf-Rayet stars related to their chemical composition, their evolutionary status, and their apparent dichotomy in two spectral sequences are discussed. Dogmas concerning WR stars are critically discussed, including the belief that WR stars lack hydrogen, that they are helium stars evolved from massive close binaries, and the existence of a second WR stage in which the star is a short-period single-lined binary. The relationship of WR stars with planetary nebulae is addressed, as is the membership of these stars in clusters and associations. The division of WR stars into WN and WC sequences is considered, questioning the reasonability of accounting for WR line formation in terms of abundance differences.
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