Observation of transient high frequency optical oscillations on three week flares of the red dwarf EV Lac

Details Observation of transient high frequency optical oscillations on three week flares of the red dwarf EV Lac Observation of transient high frequency optical oscillations on three week flares of the red dwarf EV Lac

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012hell.confr..27c&link_type=abstract

10th Hellenic Astronomical Conference, Proceedings of the conference held at Ioannina, Greece, 5-8 September 2011. Edited by Io

Astronomy and Astrophysics

Astronomy

Scientific paper

Thorough investigations on the red dwarf EV Lac indicate that transient high frequency oscillations occur during the flare event and during the quiet-star phase as well. The postulation that transient high frequency oscillations occur during the weak flares and during the quite state of this active red dwarf is a very important task. In this paper we present the results of the analysis of the B-lightcurves of three weak flares of the red dwarf EV Lac, which were observed on October of 2001, withthe help of the 30-inch Cassegrain telescope of the Stephanion Observatory. The combined use of Fractal analysis and DFT-analysis enable us to estimate the proper random noise and detect possible weak transient optical oscillations. In accordance to the results of the previous studies the results of the present study indicate that: (1) Transient high frequency oscillations occur during the flare event and during the pre-flare state as well (2) The Observed frequencies range between 0.003Hz (period 36 s) and 0.278Hz (period 3.5 s) not rigorously bounded. This result is very similar with the results of the observation of transient optical oscillation on strong and medium flares.

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