Linear polarimetry of AP stars. 3: A diagnostic method for the magnetic structure of rotating stars

Details Linear polarimetry of AP stars. 3: A diagnostic method for the magnetic structure of rotating stars Linear polarimetry of AP stars. 3: A diagnostic method for the magnetic structure of rotating stars

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...295..459b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 295, no. 2, p. 459-470

Astronomy and Astrophysics

Astrophysics

38

A Stars, Astronomical Models, Circular Polarization, Linear Polarization, Peculiar Stars, Stellar Magnetic Fields, Astronomical Polarimetry, Canonical Forms, Computerized Simulation, Mathematical Models

Scientific paper

A method for the diagnostic of magnetic fields in Ap stars is presented. It is based on the joint interpretation of traditional circular polarization observations (giving Bl, the longitudinal magnetic field averaged over the stellar surface) and of broadband linear polarization observations. The method consists in a numerical, best-fit algorithm which takes into account the possibility of describing the time variation of broadband linear polarization by means of analytical expressions. The algorithm has been checked against numerical simulations and has shown to be reliable especially for the determination of the magnetic configuration of the star. Two applications have been considered for the stars HD 24712 and HD 71866 by interpreting new broadband linear polarization observations together with circular polarization data available in the literature.

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