Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...247..455h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 247, no. 2, July 1991, p. 455-468.
Astronomy and Astrophysics
Astrophysics
186
Electron Scattering, Radiative Transfer, Stellar Atmospheres, Stellar Spectra, Stellar Winds, Wolf-Rayet Stars, Emission Spectra, Line Spectra, Monte Carlo Method, Stellar Models
Scientific paper
The importance of electron-scattering wings is examined with respect to the Wolf-Rayet (W-R) stellar spectra, the entire line profile, and the diagnosis of density inhomogeneities in stellar winds. The influence of inhomogeneities on the derived mass-loss rates is then examined to develop ideas related to W-R stellar winds and stellar evolution. Existing evidence regarding electron-scattering wings in W-R stellar spectra is reviewed, and present models are found to be inadequate to describe the weak wings. Theoretical line profiles are computed by two separate methods, and the effect of an inhomogeneous density structure on the strength of the electron-scattering wings is examined. The line profiles and line strengths are similar to observed values except that the mean mass-loss rate is lower; the corresponding reduction in the strength of the wings shows that the mass-loss rates for W-R stars are overestimated.
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