Radio Bursts on the Flare Star AD Leo from the Arecibo Observatory

Details Radio Bursts on the Flare Star AD Leo from the Arecibo Observatory Radio Bursts on the Flare Star AD Leo from the Arecibo Observatory

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...203.4802o&link_type=abstract

American Astronomical Society Meeting 203, #48.02; Bulletin of the American Astronomical Society, Vol. 35, p.1283

Astronomy and Astrophysics

Astronomy

Scientific paper

We discuss recent observations of the M dwarf flare star AD Leo taken with the Arecibo Observatory. The wide bandwidths currently available (ν eff ˜ 500 MHz) are a factor of >10 improvement over previous investigations of highly circularly polarized, high brightness temperature bursting phenomena. The large degrees of circular polarization (π c -> ±100%), coupled with large inferred brightness temperatures (Tb ≥1016K), suggest a coherent emission mechanism, but interpretation has been hindered by narrow bandwidths (Δ ν /nu ≤ few percent). We find evidence of drifting structures, whose drift rates are compatible with the range from solar type III bursts. We present a summary of the burst characteristics, and interpret the data in the framework of different coherent emission mechanisms.
RAO gratefully acknowledges support from a Jansky fellowship at NRAO.

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