Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26as..121...15h&link_type=abstract
A & A Supplement series, Vol. 121, January 1997, 15-44.
Astronomy and Astrophysics
Astronomy
23
Stars: Binaries: Symbiotic, Stars: Mass-Loss, Polarization
Scientific paper
We present numerical models of Raman-line formation in symbiotic systems, based on Monte-Carlo simulations of scattering of O vi resonance-line photons from a hot source in the extended, expanding atmosphere of a cool companion, and we explore the sensitivity of the model results to the input parameters. The model successfully reproduces the observed line ratios, velocities, and polarizations, and the viewing-angle (orbital) dependence of the line strengths and polarized intensities. In principle, the position-angle dependence of the polarization in resolved Raman lines provides a diagnostic of the extent of the ionized region in symbiotic systems; however, axisymmetric geometries with `up-down' symmetry, such as we use, fail to reproduce the most commonly observed dependence of PA on velocity. Raman-line polarization morphology is shown to be a powerful probe of the conditions in the red-giant wind; this is particularly true if observations are available at different orbital phases, so that geometrical and physical variables may more easily be isolated.
Harries Tim J.
Howarth Ian D.
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