Study of Photometric Variability of Magnetic CP Stars II.Nature of Brightness Variation

Phase light curves have been build based on photometric materials, obtained in 10 colors for different (B0-F0) magnetic CP stars. The light curves observed in the form of a double wave for most stars. The changes in the light curves occur in counter-phase, in different bands for some of the investigated late CP stars (A2-F0) of the SrCrEu type. It is shown, that the brightness variability in antiphase is explained by the energy blocking in the region λλ5000 5500ÅÅ (in range of depression λ5200Å), created mainly by rare earth elements, the excesses are reaching in the atmosphere of these stars 4.0-6.0 dex