High resolution dynamic spectrum of a spectacular radio burst from the flare star AD Leonis.

Details High resolution dynamic spectrum of a spectacular radio burst from the flare star AD Leonis. High resolution dynamic spectrum of a spectacular radio burst from the flare star AD Leonis.

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...321..841a&link_type=abstract

Astronomy and Astrophysics, v.321, p.841-849

Astronomy and Astrophysics

Astrophysics

12

Stars: Individual: Ad Leo, Stars: Flare, Radio Continuum: Stars

Scientific paper

We present an intense, highly polarised, burst recorded on 13 February 1993 from the dMe flare star AD Leonis with the Arecibo radio telescope at 1.4 GHz. The whole event lasts about 7 minutes, exhibits positive and negative drifts of the emission frequency with time, and narrow-band spikes reaching up to 350 mJy in 20 ms, some of which exhibit rapid positive drifts. Similar spikes are observed from the solar corona and from the auroral zones of the magnetized planets, most of which are attributed to an electron-cyclotron maser instability. However, plasma waves are plausible to explain some of the stellar burst characteristics. We present estimates of the source's properties using realistic models of AD Leo's atmosphere.

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