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

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Research Note

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

B.E. Zhilyaev 1, I.A. Verlyuk 1, Ya.O. Romanyuk 1, O.A. Svyatogorov 1, R.K. Konstantinova-Antova 2, A.P. Antov 2, R.S. Bachev 2, I.Yu. Alekseev 3, V.E. Chalenko 3 and D.N. Shakhovskoy 3

1 Main Astronomical Observatory, National Academy of Sciences, Golosiiv, 252650, Kyiv-650, Ukraine
2 Institute of Astronomy, Bulgarian Academy of Sciences, 72 Tsarigradsko shose, BG-1784 Sofia, Bulgaria
3 Crimean Astrophysical Observatory, Nauchny, Crimea 334413, Ukraine

Received 29 December 1997 / Accepted 27 January 1998

Abstract

The flares fine structure lies often below the detection limit for photometry data. UBVRI high-speed observations 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 filtering 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.

Key words: stars: individual: EV Lac – stars: flare – stars: variables: others

Send offprint requests to: B.E. Zhilyaev, (zhilyaev@mao.kiev.ua)

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© European Southern Observatory (ESO) 1998

Online publication: June 2, 1998

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