Optical Variability of the Nuclei of Seyfert Galaxies

The continuum variability ( UBV observations), the variations in the emission lines, and the properties of the central source in the nuclei of Seyfert galaxies are discussed. There is the quasi-periodicity in the light variations of the nuclei. The emission lines show the variations both in the intensity and the profiles. All data lead to the conclusion, that both continuum and emission-lines intensity variations are due to the variability of the central nonthermal source.

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