Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....67..345d&link_type=abstract
Astronomy and Astrophysics, vol. 67, no. 3, July 1978, p. 345-353. Research supported by the Observatoire de Paris.
Astronomy and Astrophysics
Astrophysics
29
Cosmic Dust, Light Scattering, Polarized Light, Radiative Transfer, Stellar Envelopes, Computerized Simulation, Graphite, Iron, Monte Carlo Method, Photons, Silicates
Scientific paper
A forward-scattering Monte Carlo simulation of radiative transfer in a circumstellar shell consisting of silicate, graphite, and iron particles is performed. The Stokes parameters are used to describe the state of polarization of the light emerging from the medium. In the simulation 'photons' are traced from scatter to scatter according to a prescription defined by Mie theory and the distribution of the scattering particles in the medium, each 'photon' is associated with a Stokes vector, this vector is transformed each time the 'photon' is scattered, the value of the vector when the 'photon' emerges from the medium gives its final state of polarization, and the Stokes parameters of the 'photons' emerging from a particular area in a particular direction are summed to obtain the theoretical polarization of a given region. Reddening effects in spherical shells are examined, and the polarization effects produced by prolate and oblate ellipsoids of revolution are analyzed. It is shown that the simulation can account for the properties of highly polarized stars in a somewhat ambiguous manner.
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