Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...383..729u&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 383, Dec. 20, 1991, p. 729-738. Research supported by NSERC.
Astronomy and Astrophysics
Astrophysics
20
Astronomical Spectroscopy, Spectrum Analysis, Stellar Evolution, Stellar Spectra, Wolf-Rayet Stars, Astronomical Models, Planetary Nebulae, Stellar Atmospheres, Stellar Composition, Stellar Mass Ejection, Stellar Winds
Scientific paper
The basis for the suggestion by Bhatia and Underhill (1988) to the effect that Wolf-Rayet stars are young massive objects only now arriving on the main sequence and still enveloped in a remnant of their natal cloud is reviewed, and it is shown that the arguments of Lamers et al. (1991) that Wolf-Rayet stars are the endpoints of massive star evolution are not valid. The hypothesis that Population I Wolf-Rayet stars are massive young stellar objects associated with O and B stars is useful for coordinating the available information about Wolf-Rayet stars. A few central stars of planetary nebulae also show a Wolf-Rayet-type spectrum; they appear to be low-mass stars at a late stage of evolution. It is argued that exhibiting a Wolf-Rayet-type spectrum is a trait of a few massive stars and of a few evolved low-mass stars.
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