Other
Scientific paper
Jul 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.200...91s&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 200, July 1982, p. 91-113. Research supported by the Science Research C
Other
36
Density Distribution, Light Scattering, Mie Scattering, Polarized Light, Stellar Envelopes, Stokes Law Of Radiation, Interstellar Extinction, Particle Size Distribution, Rayleigh Scattering, Refractivity, Thomson Scattering
Scientific paper
Series expressions for the normalized Stokes parameters of the scattered light are obtained in an analytic treatment of the polarization of light produced by arbitrary, spherically symmetric scattering mechanisms in optically thin and otherwise arbitrary circumstellar shells. The series expressions for the special cases of Thomson and Rayleigh scattering take an especially simple form from which axisymmetric envelope results and an analogous expression for general scattering mechanisms are derived. It is shown generally in the first-order approximation that (1) the form of the polarization-versus-wavelength dependency is independent of the specific density distribution of scatterers in the envelope, and (2) the position angle is independent of the specific scattering mechanism. It is shown, for the case of Mie scattering in cool star envelopes, that the first-order approximation is exceptionally accurate where density distributions vary smoothly.
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