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A model of a magnetic star Carlberg, Raymond G.

Abstract

A method of computing the effects of a magnetic field on the structure of a star is discussed. The field is restricted so that the magnetic force is derivable from a potential, which allows the development of a simple expression for the field and distortion to the star. The J² technique is used to derive the perturbed equations of stellar structure, the only difference from the unperturbed equations being an alteration to the effective gravity, as a function of radius. This method is applied to the computation of the structure of an upper main sequence star containing a dipolar magnetic field. The cases of the flux penetrating the convective core and the flux excluded from the core are considered. The changes in the structure of the star, the distortion of the surface and the expected changes in the observable quantities are calculated.

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