Peculiar line opacities and atmospheric structure in CP stars

The effects of elemental abundance anomalies caused by radiative diffusion on the atmospheres of chemically peculiar (CP) stars will be discussed. A brief review of the various types of CP stars and the diffusion process along with the intricacies of radiative acceleration calculations will be given. Recent progress in stellar atmosphere modeling, including the effects of the abundance stratification of the elements due to diffusion on the atmospheric structure, will be presented. The various physical phenomena that need to be included in future generations of atmospheric models of the different types of CP stars, and in particular for magnetic stars, along with the possible applications of these models will be discussed.