Monte Carlo analysis of polarization by Mie scattering in circumstellar envelopes

Details Monte Carlo analysis of polarization by Mie scattering in circumstellar envelopes Monte Carlo analysis of polarization by Mie scattering in circumstellar envelopes

Jul 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....87..204d&link_type=abstract

Astronomy and Astrophysics, vol. 87, no. 1-2, July 1980, p. 204-209.

Astronomy and Astrophysics

Astrophysics

27

Electromagnetic Scattering, Mie Scattering, Monte Carlo Method, Polarization Characteristics, Stellar Envelopes, Circular Polarization, Interstellar Extinction, Refractivity, Stellar Radiation

Scientific paper

The present work is a theoretical analysis of polarization by Mie scattering in circumstellar dust shells. It follows and generalizes a previous work (Daniel, 1978) with the assumption that wavelength has little or no effect on the refractive index m. A systematic study has been carried out for some models of envelopes (ellipsoids of revolution) and various materials (silicate, graphite). For an unpolarized point star at the centre of a uniform ellipsoidal envelope, the degree of polarization P cannot be more than 11-12%. A 90° rotation of the polarization direction is brought into evidence, which has an analytic basis: for a refractive index m = n - jk, changes in the direction of polarization are, in first approximation, given by the values of x = 2πα/λ solutions of
Δ = 0, where Δ = π∫(i1(θ)-i2(θ)) sin θdθ/π∫(i1(θ) -i2(θ)+i2(θ)) sin θdθ is
a "direction parameter". That is chiefly true for k ≃ 0 (dielectrics). The variations in Δ and P are correlated. The change in the polarization direction is likely to constitute an observational test. Satisfying applications to VY CMa and IRC 10216 have been made.

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