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Short-Time Flare Events of EV Lac

Published online by Cambridge University Press:  12 April 2016

B.E. Zhilyaev  and
I.A. Verlyuk
B.E. Zhilyaev
Affiliation:
Main Astronomical Observatory, National Academy of Sciences of Ukraine, 252650 Kiev, Ukraine
I.A. Verlyuk
Affiliation:
Main Astronomical Observatory, National Academy of Sciences of Ukraine, 252650 Kiev, Ukraine

Extract

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Moffett (1972) pointed out the existence of short-time outbursts in flare stars as long ago as 1972. Gershberg & Petrov (1986) had registered a flare in EV Lac with a duration of 28.4 and an amplitude of 38.4 in 1984 with ASTRON. In recent years, a few reports appeared about observations of short-time outbursts in EV Lac with a duration in the range from 08.1 to several seconds. These results were summarized briefly by Zhilyaev (1993). Our observations confirm the existence of short-time flare activity on EV Lac.

The observations reported here were obtained at the 60 cm telescope at the Peak Terskol high-altitude Observatory (3 100 m above sea level) with a highspeed two-channel photometer (Zhilyaev et al. 1992) in B as well as simultaneously in both, U and V bands, with a time resolution down to 08.1. A new prefiltering technique (Zhilyaev 1995) has been used for the detection of smallscale activity of the flare star EV Lac.

Type
Flares in Late-type Stars: Radio and Optical
Information
International Astronomical Union Colloquium , Volume 151: Flares and Flashes , 1995 , pp. 80 - 81
Copyright
Copyright © Springer-Verlag 1995

References

Gershberg, R.E., Petrov, P.P., 1986, Flare Stars and Related Objects, Publishing House of Acad. of Sci., Yerevan, p. 38 Google Scholar
Moffett, Y.J., 1972, Nature 240, 41 Google Scholar
Zhilyaev, B.E., Romaniuk, Ya.O., Svyatogorov, O.A., 1990, IAU Symp. 137, 35 Google Scholar
Zhilyaev, B.E., Romaniuk, Ya.O., Svyatogorov, O.A., 1992, AZh 69, 895 Google Scholar
Zhilyaev, B.E., 1993, Kinematics and Physics of Celestial Bodies, 10, 32 Google Scholar
Zhilyaev, B.E., 1995, this volume, p. 133 Google Scholar