A polarimetric investigation of a magnetically driven Be star wind

Details A polarimetric investigation of a magnetically driven Be star wind A polarimetric investigation of a magnetically driven Be star wind

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.260..525f&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 260, no. 3, p. 525-528.

Astronomy and Astrophysics

Astronomy

7

Astronomical Polarimetry, B Stars, Stellar Magnetic Fields, Stellar Models, Stellar Winds, Linear Polarization, Optical Thickness, Stellar Envelopes

Scientific paper

The Be star wind model of Ringuelet & Iglesias is investigated polarimetrically. By imposing the condition that the scattering optical depth in the equatorial plane be tau = 1, it is found that the theoretical (continuum) linear polarization depends essentially upon two parameters: an optical depth (which is a measure of the envelope oblateness) and the location of the inner boundary of the cool extended envelope. The observed range in polarization can be explained if Be stars possess stellar magnetic fields of B(0) less than 100 G. According to the model, the observed increase in polarization of Be stars during the onset of a shell phase is indicative of an increased magnetic field.

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