Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.2914o&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #29.14; Bulletin of the American Astronomical Society, V
Astronomy and Astrophysics
Astronomy
Scientific paper
We report on observations of two radio bursts at wavelengths 18--27 cm seen on the flare star AD Leonis with the Arecibo Observatory in April 2005. These observations are unique in providing the highest time resolution (1 ms) and largest instantaneous contiguous frequency coverage (Δ ν 400 MHz) of stellar radio bursts. The second radio burst on April 9, 2005 near 01:14:50 UT, exhibited a combination of fast-drifting radio bursts and diffuse emission. A comparison of this data degraded to 10 ms time resolution with previous radio bursts (reported in Osten & Bastian 2006) reveals numerous similarities. However, when examined at the highest time resolution, the drifting radio bursts have predominantly negative slopes (the bursts appear at high frequency and drift to lower frequencies), with a characteristic drift rate of 3 GHz/s. We discuss this new finding in light of possible coherent emission mechanisms, and suggest that these properties are consistent with plasma radiation from beams of accelerated particles traversing AD Leo's low corona.
Bastian Th.
Osten Rachel Ann
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