Abstract
Sinusoidal variations in Johnson'sB-band of the flare star EV Lac have been confirmed at its quiet state luminosity. The cycle lengths are more than one hour and less than two hours with amplitudes varying from 0 m. 105 to 0 m. 306. These registered cycles have agreed with cycles detected by Mavridis and Varvoglis (1990) and Mavridis (1990). In the same time, the cycles have confirmed the light variation detection in Johnson'sV-band in the same flare star by Pettersen (1980) with a cyclic period equals about 4 d. 378 and an amplitude of about 0 m. 07. Our net results confirm, to some extent, the presence of active region(s) as an origin of stellar flare phenomenon of UV Ceti type flare stars. We can cautiously say that the solar and stellar flare phenomenon have a similar origin.
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Mahmoud, F.M. Very short-term behaviour of the flare star EV Lac. Astrophys Space Sci 208, 205–215 (1993). https://doi.org/10.1007/BF00657936
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DOI: https://doi.org/10.1007/BF00657936