Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992ap%26ss.187..219f&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 187, no. 2, Jan. 1992, p. 219-239.
Astronomy and Astrophysics
Astrophysics
3
Binary Stars, Polarized Electromagnetic Radiation, Stellar Envelopes, Stellar Rotation, Electron Scattering, Neutron Stars, Periodic Variations, Point Sources, Stellar Orbits
Scientific paper
The polarimetric variability of stars possessing an obliquely rotating envelope is investigated in the optically thin single-electron-scattering approximation. It is shown that in the point-light-source treatment one is unable to distinguish between polarimetric variability occurring due to rotation about a body axis and (binary) orbital motion. It is shown that polarimetric discrimination between envelope geometries is possible (to some extent) when the light source is considered to be finite in extent due to the possible occultation of some of the scatterers resulting in polarimetric variability that cannot be explained by the canonical point light source models. Two diametrically opposite spots and an obliquely rotating near-planar disk are used as examples. An account is made of the spectroscopic variability of the two geometries considered which again indicates that geometry discrimination is possible.
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