Radiative accelerations in magnetic atmospheres - Polarization effects

Statistics – Computation

Scientific paper

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A Stars, Peculiar Stars, Polarized Radiation, Stellar Atmospheres, Stellar Magnetic Fields, Abundance, Computational Astrophysics, Radiative Transfer

Scientific paper

New observational constraints on abundance inhomogeneities on the surface of Ap stars have shown the need for detailed calculations of the effects of magnetic fields on diffusion, in particular through the radiative acceleration. How radiative accelerations have to be computed in polarized transfer is described. It is shown that the presence of a strong magnetic field can lead to a significant amplification of the radiative acceleration through desaturation of the spectral lines and that a polarized radiation can lead to important horizontal drifts on the stellar surface which have to be included in modeling Ap stars. These effects are calculated in detail for strontium. It is shown that for strontium, the effects of polarization are large and could explain the relative strontium underabundance observed in the horizontal field region of 53 Cam.

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