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Electrophotometric observations of the EV Lac flares in U, Hα and Hβ

Published online by Cambridge University Press:  23 September 2016

A.S. Melkonian
A.S. Melkonian*
Affiliation:
Byurakan Astrophysical Observatory Armenian Academy of Sciences, USSR

Abstract

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Results of the patrol observations of the EV Lac flares in U, Hα and Hβ bands are given. The observations are carried out simultaneously in U and Hα or in U and Hβ. During (U, Hα) observations 21 U -flares are registered of which only comparatively strong one is accompanied by a real Hα - flare. And during (U, Hβ) observations among 7 U-flares the strongest and a “slow” one is accompanied with an increase of Hβ -signal. Small amplitude periodic light variations of EV Lac are detected with a period of 3d. 3 and amplitude 0m.02 in B and V bands.

Type
I Flare Stars Optical Observations and Flare Statistics
Information
Symposium - International Astronomical Union , Volume 137: Flare Stars in Star Clusters, Association and Solar Vicinity , 1990 , pp. 25 - 26
Copyright
Copyright © Kluwer 1990 

References

1. Gershberg, R.E. and Chugainov, P.F. (1966) ‘Photoelectric and spectrographic observations of flares on AD Leo in 1965’, Astron.J., 43, 1168–1178.Google Scholar
2. Ambartsumian, V.A. (1971) ‘Fuors’, Astrofizika, 7, 557–572.Google Scholar