Abundance distributions over the surfaces of magnetic ApBp stars: Theoretical predictions

Abstract

Recently published empirical abundance maps, obtained through (Zeeman) Doppler mapping, do not currently agree with the abundance structures predicted by means of numerical models of atomic diffusion inmagnetic atmospheres of ApBp stars. In a first step towards the resolution of these discrepancies, we present a state of the art grid of equilibrium abundance stratifications in the atmosphere of a magnetic Ap star with Teff = 10 000 K and log g = 4.0. A description of the behaviour of 16 chemical elements including predictions concerning the over- and/or underabundances over the stellar surface is followed by a discussion of the possible influence of presently neglected physical processes.