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

摘要

In this paper the presence of high-frequency oscillations on two weak flares of the G8 dwarf V390 Auri is investigated. The combined use of fractal analysis and DFT-analysis enable us to estimate proper random noise and to detect possible weak transient optical oscillations. In accordance with 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, not rigorously bounded, range between 0.011 Hz (period 1.5 min) and 0.083 Hz (period 12 s). This result is in accordance with the results of the observation of transient optical oscillation on strong and medium flares.