Chemical composition and stratification in the atmosphere of Ap star HD 110066 (AX CVn)

The results of the analysis of the chemical composition and inhomogeneous distribution (stratification) of Fe and Cr in the atmosphere of a magnetic chemically-peculiar star HD 110066 (AX CVn) are presented. The lines of these elements make an important contribution to the opacity, and the presence of stratification affects the emergent fluxes. These results are used in determining the fundamental parameters: T eff, lg g, R/R⊙, L/L log⊙ from a self-consistent analysis of high-resolution (R = 81000) spectra and the observed flux distribution in a wide spectral range. The chemical abundances show typical behavior for stars of this class: there is a depletion of CNO and an excess of the rare-earth elements compared to their solar abundances, by 3-4 orders of magnitude. The distribution of Fe and Cr is generally consistent with theoretical predictions of the diffusion theory.