Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...308..521h&link_type=abstract
Astronomy and Astrophysics, v.308, p.521-534
Astronomy and Astrophysics
Astrophysics
19
Polarization, Radiative Transfer, Circumstellar Matter, Line: Formation, Stars: Wolf-Rayet
Scientific paper
Previously we developed a numerical method to solve the continuum polarized radiative transfer equation for the case of scattering by particles with a Rayleigh phase matrix in axisymmetric geometries. Here we extend the method to compute polarized line profiles in stars with extended and expanding envelopes, but with the restriction that the polarization in the line and continuum arises entirely from electron scattering. The method, extensively tested using Monte-Carlo calculations, treats optically thick lines, allows for extension of the line formation area relative to that of the continuum, and incorporates the frequency redistribution of photons caused by the thermal and bulk motions of the electrons. Test calculations are used to illustrate the effect that thermal broadening, line absorption, stratification, and inclination have on the emergent polarized line profile.
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