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Astron. Astrophys. 334, 931-934 (1998)

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4. Conclusions

Multicolor high-speed observations combined with synchronous monitoring at two distant telescopes allow one to detect new fine-scale features in flare activity of EV Lac. Our photometric data and the filtering technique make possible the detecting of events with amplitudes as small as 0.01 mag, comparable to the limit of counting statistics. A new kind of flares observed for first time by Zhilyaev and Verlyuk (1995) is confirmed. These events are composed of a flare and a related intensity drop in the B to I bands. That crater-shaped structure is centered at the flare peak. A decrease of the star luminosity occurs before the flare itself. The pre-flare dip mentioned by many observers can be considered as part of this fading. It is of interest that this activity is common to both short-lived and long-duration flare events. These results should yield new insights into the physics of stellar flares.

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© European Southern Observatory (ESO) 1998

Online publication: June 2, 1998