Spectropolarimetry of "disks" around Wolf-Rayet stars.

Details Spectropolarimetry of "disks" around Wolf-Rayet stars. Spectropolarimetry of "disks" around Wolf-Rayet stars.

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991spec.book.....s&link_type=abstract

"Spectropolarimetry of "disks" around Wolf-Rayet stars., by Schulte-Ladbeck, R. E.; Meade, M. R.; Hillier, D. J.. Wis. Astrophy

Astronomy and Astrophysics

Astrophysics

Scientific paper

The authors are in the process of conducting a northern and southern hemisphere spectropolarimetric survey of Wolf-Rayet stars to explore the occurrence of non-spherical outflows. Of 30 objects measured so far, 4 display reduced levels of polarization across emission lines, indicating nonsphericity. Two Wolf-Rayet stars, EZ CMa (WR6, WN5) and HD 197165 (WR134, WN6), are considered to possess globally distorted, axisymmetric winds. This allows to study continuum opacity sources, ionization stratification, and wind dynamics. Polarized line profiles in these stars are redshifted, and show an extended red wing, providing strong evidence for the importance of electron scattering in the envelopes of Wolf-Rayet stars. Time-dependent polarimetry is used to assess the incidence of wind inhomogeneities, and their temporal and spatial proliferation.

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