Mathematics – Probability
Scientific paper
Feb 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1094..680l&link_type=abstract
COOL STARS, STELLAR SYSTEMS AND THE SUN: Proceedings of the 15th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun.
Mathematics
Probability
1
Stellar Activity, Main-Sequence: Late-Type Stars, Binary And Multiple Stars
Scientific paper
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.
Hanslmeier Arnold
Khodachenko Maxim L.
Konovalenko Aleksander
Lammer Helmut
Leitzinger Martin
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