The appearance of polarization in radiation from hot stars due to the Faraday rotation effect as a possible method of determining stellar magnetic fields

Details The appearance of polarization in radiation from hot stars due to the Faraday rotation effect as a possible method of determining stellar magnetic fields The appearance of polarization in radiation from hot stars due to the Faraday rotation effect as a possible method of determining stellar magnetic fields

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984ap%26ss.102..375g&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 102, no. 2, July 1984, p. 375-395.

Astronomy and Astrophysics

Astrophysics

20

Faraday Effect, Hot Stars, Polarized Radiation, Stellar Magnetic Fields, Stellar Radiation, Light Scattering, Linear Polarization, Magnetic Dipoles, Scattering Cross Sections, Stellar Envelopes

Scientific paper

The effect of Faraday rotation is shown to lead to the appearance of linear polarization of stellar radiation scattered in an optically-thin circumstellar electron-magnetized shell, even in the case when the shell is spherical. The spectral dependence of the polarization degree is evaluated for scattering in (i) a spherically-symmetric magnetized shell with a power-law radial dependence of the electron density, and (ii) a non-spherical eflipsoidal uniform envelope. The position of maximum in the polarization spectrum permits us to determine the magnetic field magnitude on a star surface. If the rotational and magnetic axes do not coincide, the periodic variability of the polarization will be observed with the period of stellar rotation. Some Be-stars, such as y Cas, 48 Lib, EW Lac, it Aqr, HD 45677, X Per, are proposed as candidates to be investigated for magnetic fields, as well as some stars of the T Tau-type. This method may be also applied to supernovae shells

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