Early-type stars in OB associations in the infrared. II - A discussion of density and temperature distributions in stellar winds

Details Early-type stars in OB associations in the infrared. II - A discussion of density and temperature distributions in stellar winds Early-type stars in OB associations in the infrared. II - A discussion of density and temperature distributions in stellar winds

Mar 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...144...87b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 144, no. 1, March 1985, p. 87-97. Sponsorship: Deutsche Forschungsgemeinschaft

Statistics

Computation

35

B Stars, Early Stars, Infrared Stars, O Stars, Stellar Winds, Computational Astrophysics, Gas Density, Infrared Spectra, Radiant Flux Density, Star Clusters, Stellar Temperature, Wind Velocity

Scientific paper

Numerical computations of the infrared flux distribution in early-type stars with mass loss are presented. After assuming that infrared radiation is due both to the stellar photosphere and to free-free and free-bound transitions in the ionized stellar wind, the influence of mass-loss rate and wind velocity-law on the infrared flux is studied. A significant infrared excess over the photospheric flux will only be observed when the mass-loss rate is larger than about 10 to the -6th solar masses/yr, and/or when the velocity gradient is moderate. By matching computed and observed flux distributions, the velocity law of a sample of OB stars with spectral types ranging from O4 to B2 is investigated. While the velocity law derived from the infrared flux of O stars is consistent with that expected from a radiatively-driven wind, early B stars show, on the average, a smoother velocity gradient.

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