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Title:
Infrared photometry and mass loss rates for Of-type stars
Authors:
Persi, P.; Ferrari-Toniolo, M.; Grasdalen, G. L.
Affiliation:
AA(CNR, Istituto Astrofisica Spaziale, Frascati, Italy), AB(CNR, Istituto Astrofisica Spaziale, Frascati, Italy), AC(Wyoming, University, Laramie, WY)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 269, June 15, 1983, p. 625-633. (ApJ Homepage)
Publication Date:
06/1983
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
INFRARED ASTRONOMY, INFRARED PHOTOMETRY, MASS FLOW RATE, O STARS, STELLAR MASS EJECTION, STELLAR SPECTROPHOTOMETRY, ASTRONOMICAL CATALOGS, BINARY STARS, STELLAR LUMINOSITY, STELLAR MODELS
DOI:
10.1086/161069
Bibliographic Code:
1983ApJ...269..625P

Abstract

The Of-type stars represent an interesting class of luminous O-type stars characterized by emission in N III lambda 4640. Castor et al. (1975) proposed a model in which the wind from Of stars is driven by the force of radiation absorbed in a large number of spectral lines. In this connection, accurate determinations of mass loss rates are very important in understanding the physical processes in the winds of Of-type stars and in studying their evolution. The present investigation reports additional mass loss rates derived from accurate IR photometry from 2.3 microns up to 10 microns of 15 Of-type stars. The considered IR observations suggest that a unique model cannot explain the wind's properties in Of-type stars. While the radiation-driven wind model may be applied for some Of-type stars, the observed high wind momentum in other stars, especially in Of stars, requires an additional or different mechanism to drive the wind as proposed for WR stars.

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