Pan'ko O. Long-term variability of the emission spectra of Be stars of different types.

The dissertation contains the results of study of the long-term emission activity of Be stars with different dominating variability types: beta Cep, omicron And, zeta Tau, EM Cep. Star variability was analyzed by patrol observations obtained at 1985 - 2000. The characteristics of variability of Н-alpha line basic parameters were studied and interpreted. There were found features of the beginning stage of omicron And envelope development. The evaluation of secondary component parameters for beta Cep and zeta Tau and dominating EM Cep variability type were obtained. The results, which were obtained for all program stars premise work out in detail Be phenomenon description Field of use: astrophysics.