Further investigation of the high frequency optical oscillations during the flare phase of the red dwarf EV Lac

Further investigation of the high frequency optical oscillations during the flare phase of the red dwarf EV Lac

In this paper we present the results of the analysis of the U-light curve for a flare of magnitude 1.2, which was observed on September 2004, with the help of the 30-inch Cassegrain telescope of the Stephanion Observatory. The results of both, DFT-analysis and wavelet analysis, indicate that (a) Osc...

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Hauptverfasser: Contadakis, M E, Avgoloupis, S J, Seiradakis, J H
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description In this paper we present the results of the analysis of the U-light curve for a flare of magnitude 1.2, which was observed on September 2004, with the help of the 30-inch Cassegrain telescope of the Stephanion Observatory. The results of both, DFT-analysis and wavelet analysis, indicate that (a) Oscillations with period 1 to 1.5min, 11s, 7.5s and 5.5s appear during the pre-flare state and persist during the whole flare state, (b) From the flare maximum phase on, a progressive increase of oscillations with periods 20s up to 4.0s is markedly indicated and (c) At the end of the flare only the oscillation of the pre-flare state do remain. This result is in favour of (or does not contradict) the suggested explanation, i.e. the evolution of a fast mode magneto-acoustic wave generated at the impulsive phase of the flare and traveling through the magnetic loop.
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title Further investigation of the high frequency optical oscillations during the flare phase of the red dwarf EV Lac
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