Stellar occultation of polarized light from circumstellar electrons. III - General axisymmetric envelopes

Details Stellar occultation of polarized light from circumstellar electrons. III - General axisymmetric envelopes Stellar occultation of polarized light from circumstellar electrons. III - General axisymmetric envelopes

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...379..663f&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 379, Oct. 1, 1991, p. 663-675. Research supported by Department of Health a

Statistics

Computation

35

Computational Astrophysics, Polarized Light, Stellar Envelopes, Stellar Occultation, Astronomical Polarimetry, B Stars, Depolarization, Light Sources, Stellar Models

Scientific paper

The effects of occultation and depolarization upon the theoretical polarization from axisymmetric circumstellar envelopes are considered for a finite size, spherical light source. The resulting expression for the net polarization is found to have a complicated inclination dependence, such that the Brown and McLean (1977) result of P proportional to sin-squared i no longer holds. The deviation of the variation of polarization with inclination from the Brown and McLean result is shown for three specific geometries. The results indicate that the McLean and Brown (1978) statistical analysis of the variation of polarization with V sin i questionable (except for spheroidal envelopes). It is further found that for Be stars, which exhibit polarizations of up to 2 percent, the circumstellar envelope is required to be concentrated either toward the equatorial or polar regions of the star and the optical depth must be tau greater than 0.05. It is also shown that the ellipsoidal/spheroidal envelope model of Doazan and Thomas (1982) is unlikely to produce such a high degree of polarization.

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