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[48.02] Radio Bursts on the Flare Star AD Leo from the Arecibo Observatory

R. A. Osten, T. S. Bastian (NRAO, Charlottesville)

We discuss recent observations of the M dwarf flare star AD~Leo taken with the Arecibo Observatory. The wide bandwidths currently available (\nu_{\rm 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 (\pi_c arrow ±100%), coupled with large inferred brightness temperatures (T_b \geq10¹⁶K), suggest a coherent emission mechanism, but interpretation has been hindered by narrow bandwidths (\Delta \nu/nu \leq 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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Bulletin of the American Astronomical Society, 35#5
© 2003. The American Astronomical Soceity.