Diffusion and Chemical Transport in Stellar Atmospheres

Diffusion and Chemical Transport in Stellar Atmospheres

G. Michaud, J. Richer

The current status of particle transport calculations in the atmospheres of ApBp stars is critically described. We emphasize the importance of the inner boundary condition, that is the time-dependent chemical flux and composition below the atmosphere which is determined by the interior evolution. For the non-magnetic HgMn stars a number of observed anomalies are explained with little arbitrariness, though isotope anomalies and observed variations from star to star are challenging. For the magnetic ApBp stars, detailed quantitative models of the observed mapping and size of anomalies are still lacking. Not all required hydrodynamical ingredients are currently included.

Proceedings of the Polish Astronomical Society, vol. 11, 185-193 (2020)

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