THE EFFECT OF PECULIARITY IN THE ATMOSPHERES OF MAGNETIC CP STARS

Abstract

The paper presents the results of a study of the role of the peculiarity effect - the influence of chemical anomalies and a strong magnetic field in the atmospheres of about 30 different magnetic stars, which are located in the spectral range of B4-F0. To this end, extremal phases were determined for each star corresponding to the spotted and (relatively) normal region on the surface of
the star. The role of the chemical anomaly and the magnetic field separately and their combined actions are analyzed in detail. The role of anomalies in the chemical composition leads to the appearance of an additional source of opacity - a coating effect in the atmosphere of CP stars. The magnetic field changes the structure along with the height of the atmosphere and strengthens
the spectral lines and depression in the continuum, which manifests itself at different depths of the atmosphere of the stars under study. Extra-atmospheric observations also indicate that the distribution of the chemical anomaly over the height of the atmosphere is not monotonic, but is stratified - stepwise. In peculiar areas, depending on their types of peculiarity, magnetic field intensity and temperature, several depressions are found in the continuum (e.g., (lambda)1400, (lambda)1600, (lambda)2500, (lambda)3700, (lambda)4100, (lambda)5200 AA, etc.). It is concluded that, due to the peculiarity effect in the region of spots, the atmospheric structure of magnetic CP stars has a stratification - layered character.