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Physical Properties of Wolf-Rayet Stars

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Crowther, Paul A.·2007·Annual Review of Astronomy and Astrophysics

Abstract

The striking broad emission line spectroscopic appearance of Wolf-Rayet (WR) stars has long defied analysis, owing to the extreme physical conditions within their line- and continuum-forming regions. Recently, model atmosphere studies have advanced sufficiently to enable the determination of stellar temperatures, luminosities, abundances, ionizing fluxes, and wind properties. The observed distributions of nitrogen- (WN) and carbon (WC)-sequence WR stars in the Milky Way and in nearby star-forming galaxies are discussed; these imply lower limits to progenitor masses of ∼25, 40, and 75 M⊙ for hydrogen-depleted (He-burning) WN, WC, and H-rich (H-burning) WN stars, respectively. WR stars in massive star binaries permit studies of wind-wind interactions and dust formation in WC systems. They also show that WR stars have typical masses of 10–25 M⊙, extending up to 80 M⊙ for H-rich WN stars. Theoretical and observational evidence that WR winds depend on metallicity is presented, with implications for evolutionary models, ionizing fluxes, and the role of WR stars within the context of core-collapse supernovae and long-duration gamma-ray bursts.

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Metadata

Authors
Crowther, P. A.
Venue
Annual Review of Astronomy and Astrophysics
Published
2007-09-01
Volume
45
Issue
1
Pages
177-219
ISSN
  • 0066-4146 (ISSN-L)
  • 1545-4282
OpenAlex
W2144755172
Cited by
990
References
66
FWCI
2.94
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: Physical Properties of Wolf-Rayet Stars. https://app.cochat.ai/papers/10.1146/annurev.astro.45.051806.110615
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Crowther, P. A. (2007). Physical Properties of Wolf-Rayet Stars. Annual Review of Astronomy and Astrophysics. https://doi.org/10.1146/annurev.astro.45.051806.110615

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