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Parameters of Wolf-Rayet Stars

Published online by Cambridge University Press:  04 August 2017

Peter S. Conti
Peter S. Conti*
Affiliation:
Joint Institute for Laboratory Astrophysics University of Colorado and National Bureau of Standards Boulder, Colorado 80309

Extract

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Wolf-Rayet (W-R) stars are objects with strong emission lines in the optical region due to a substantial stellar wind. They are found among the extreme Population I stars which are the topic of this Symposium and also this talk, and as central stars of planetary nebulae which I will not discuss here. The mass loss rates, Ṁ, are typically several 10−5 solar masses per year. W-R stars come in two major subtypes, the WN, in which strong lines of helium and nitrogen are seen, and the WC, in which strong lines of carbon and oxygen are found, along with the helium ions. In a few WN stars hydrogen appears to be present but the spectra of W-R stars are notable for the absence of this element. Absorption lines are generally not found in W-R stars, except in some instances due to a binary companion, or a more distant companion, or as a P-Cygni profile associated with certain emission features. An absorption spectrum appears to be an intrinsic feature in a very few WN stars.

Type
Session 4. Other Luminous Stars with Emission Lines
Information
Symposium - International Astronomical Union , Volume 116: Luminous Stars and Associations in Galaxies , 1986 , pp. 199 - 214
Copyright
Copyright © Reidel 1986 

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