Physics
Scientific paper
Nov 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994ap%26ss.221..137r&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 221, no. 1-2, p. 137-153
Physics
31
Inhomogeneity, Stellar Physics, Stellar Winds, Variability, Velocity Distribution, Wolf-Rayet Stars, Histograms, Optical Measurement, Perturbation, Spectroscopy, Stellar Models, Stellar Structure, Turbulence
Scientific paper
Recent high quality spectra in the wavelength range 5300-6000 A of 9 Wolf-Rayet (WR) stars of different subtypes are presented to study the intrinsic variability of the WR winds. These data clearly show variable subpeaks superimposed on the emission lines of all stars. The global level of variability of the lines decreases while more subpeaks are seen for stars with faster winds. The spectroscopic variations are associated to the presence of perturbations in the stellar winds. An inhomogeneity model is developed to study the dynamic and the physical characteristics of the wind perturbations. In the case of HD193793, for which more structures have been detected, a comparison with the general velocity law gives beta greater than 3. The internal velocity dispersion is larger in the direction of propagation than perpendicular to it. A power law fitted to the flux histogram of each stars gives an average exponent which is compatible with the one seen for giant molecular clouds where supersonic turbulence prevails.
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