Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...271..492w&link_type=abstract
Astronomy and Astrophysics, Vol. 271, p. 492 (1993)
Astronomy and Astrophysics
Astrophysics
42
Lines: Profile, Polarisation, Stars: Circumstellar Matter
Scientific paper
Frequency dependent expressions are derived for the degree of linear polarisation and position angle for the case of pure Thomson scattering off of electrons in non-relativistic bulk motion in an optically thin circumstellar region.
A preliminary investigation has been made into the variation in linear polarisation and polarimetric position angle across an emission line Thomson scattered in a rotating, expanding planar disc. The linear polarisation is found to be asymmetric about the line centre and stronger in the red wing unless there is no disc expansion. This red-shifting of spectral features is similar to numerical results previously reported for the case of dust scattering in an expanding shell. Changes in position angle across the line occur through the symmetry-breaking effects of stellar occultation of the scattering material and the combination of rotation and expansion of the disc.
Brown John C.
Fox Geoffrey K.
Wood Kathleen
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