Influence of the Faraday rotation effect on the polarization spectrum of Be stars with dipole magnetic fields

Astronomy and Astrophysics – Astronomy

Scientific paper

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B Stars, Faraday Effect, Linear Polarization, Stellar Magnetic Fields, Stellar Spectra, Electron Scattering, Magnetic Dipoles, Stellar Envelopes

Scientific paper

Results are presented of computations of the linear polarization spectrum of the radiation of Be stars with dipole magnetic fields using circumstellar envelope models. The following factors and physical mechanisms are taken into account: single electron scattering of stellar radiation in the envelope, selective absorption in the envelope, the contribution of the unpolarized envelope radiation, the Faraday rotation of the polarization plane in the presence of the magnetic field, and the finite size of a star that is not a pointlike source. The influence of the various factors on the formation of the spectral dependence of the degree of polarization is discussed.

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