Search

We present first-time observations of M dwarfs AD Leonis and EV Lacertae in the decametric range using digital multichannel devices as back-end facilities on World’s largest decameter array, the UTR-2 near Kharkov of the Ukrainian Academy of Sciences. Our aim is to find radio signatures of high activity phenomena, such as flares and CMEs. As known from the sun these phenomena cause particle beams and shock waves, which show up as bursts in dynamic radio spectra. Both stars are known to be young and active, and both show, besides others, structures in their spectra which are similar to solar decameter type II and III bursts. Several criteria are applied to discriminate between stellar and artificial emission, showing that some of the detected structures have a high probability of being of stellar origin. Averaging of the spectra in time and frequency is also applied to make possible bursts visible. Both radio campaigns were accompanied by coordinated optical photometry for a possible correlation of optical flares and decameter radio bursts. [ABSTRACT FROM AUTHOR]

The discovery of several planets around M dwarfs during the last years has renewed the interest in the possible habitability of these stars. Extreme stellar activity, such as observed on many of the younger M stars, could be harmful to the evolution of life. To address this topic we are working on the compilation of a catalogue of nearby M stars, which will include basic stellar properties as well as activity-related data. The current status and preliminary results of this work are presented. [ABSTRACT FROM AUTHOR]