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Observations of High-Frequency Activity of EV Lacertae

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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The flare star EV Lac shows a wide variety of activity phenomena on a wide range of time scales. These are the well-known “classical” solar-like flares, the short-time flare events (Gershberg & Petrov 1986, Karapetian & Zalinian 1991, Tovmassian & Zalinian 1988, Tsvetkov et al. 1986, Zhilyaev 1994), and the long-duration variations caused by starspots and rotation (Petterson 1980). However, the “classical” flares are not such a frequent phenomenon as one gets used to think. As noted by Roizman & Kabitchev (1985), a considerable fraction of flares shows a complicated multipeak structure with sudden onset and decay. Their interpretation along the lines of classical models favored for solar-like flares is very problematic.

Here, we report the detection of high-frequency chaotic variability (flickering) in EV Lac. Optical flickering is observed in cataclysmic binaries, and in X-rays it is observed in low-mass X-ray binaries. As a rule, flickering is an accretion phenomenon. Strange as it may seem, EV Lac as a visual binary has the analogous property.

Type
Flares in Late-type Stars: Radio and Optical
Information
International Astronomical Union Colloquium , Volume 151: Flares and Flashes , 1995 , pp. 82 - 84
Copyright
Copyright © Springer-Verlag 1995

References

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