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Here we investigate the connection of broad emission line shapes andcontinuum light curve variability time scales of type-1 Active Galactic Nuclei(AGN). We developed a new model to describe optical broad emission lines as anaccretion disk model of a line profile with additional ring emission. Weconnect ring radii with orbital time scales derived from optical light curves,and using Kepler's third law, we calculate mass of central supermassive blackhole (SMBH). The obtained results for central black hole masses are in a goodagreement with {other methods. This indicates that the variability time scalesof AGN may not be stochastic, but rather connected to the orbital time scaleswhich depend on the central SMBH mass.

Exploring possible relations between optical variability time scales and broad emission line shapes in AGN