Transient high frequency optical oscillations on two weak flares of the red dwarf V390 Auri

Details Transient high frequency optical oscillations on two weak flares of the red dwarf V390 Auri Transient high frequency optical oscillations on two weak flares of the red dwarf V390 Auri

Jul 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jena.confe..74c&link_type=abstract

JENAM 2011,European Week of Astronomy and Space Science, Book of Abstracs

Astronomy and Astrophysics

Astronomy

Flare Stars, High Frequency Oscillations, Dft Analysis, Flare Stars, High Frequency Optical Oscillations, Fft Analysis

Scientific paper

Thorough investigations on the red dwarf EV Lac, YZ CMin and AD Leo indicate that transient high frequency oscillations occur during the flare event and during the quiet-star phase as well. The postulation that this is a general characteristic of the active red dwarf is a very important task. In the frame of this consideration we present in this paper the results of the analysis of the B-light curve for the flares of the red dwarf AD Leo, which were observed on March of 2000, with the help of the 30-inch Cassegrain telescope of the Stephanion Observatory. The combined use of Fractal analysis, DFT-analysis and Wavelet 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 (2) The Observed frequencies range between 0.0083Hz (period 2min) and 0.130Hz (period 8s) not rigorously bounded. 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 travelling through the magnetic loop. This procedure may occur many times during the development of a large flare.

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