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New features in the EV Lacertae flares discovered by fast high precision UBVRI photometry

The flares fine structure lies often below the detec- tion limit for photometry data. UBVRI high-speed observa- tions combined with synchronous monitoring at two telescopes situated far from each other allowed us to detect new small- amplitude features in the flare activity of EV Lac. Digital fil- tering of the light curves with a Gaussian window was used. We found that some flare events are composed of a flare and an intensity drop having a crater-shaped structure centered at the flare peak. Fading amplitudes extend from 0.1 to 0.01 mag.