Dynamic spectra of radio bursts from flare stars

Details Dynamic spectra of radio bursts from flare stars Dynamic spectra of radio bursts from flare stars

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...353..265b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 353, April 10, 1990, p. 265-273.

Astronomy and Astrophysics

Astrophysics

66

Flare Stars, M Stars, Radio Bursts, Stellar Spectra, Brightness Temperature, Coherent Radiation, Electron Plasma, Emission Spectra, Spectral Line Width, Very Large Array (Vla)

Scientific paper

The Arecibo 305 m telescope has been used to observe radio bursts from flare stars at 430 and 1415 MHz. Dynamic spectra of the emission with bandwidths of 10 MHz in the former case and 40 MHz in the latter are recorded. For AD Leo, the microwave burst emission was 100 percent right circularly polarized, achieved brightness temperatures near 10 to the 16th K, was generally broadband in character, but was superposed with finite structures in both frequency and time. Quasi-periodic pulsations were clearly present as well as a sudden reduction feature. For YZ CMi, the emission was 100 percent left circularly polarized and was relatively broadband with fine structures. Instabilities driven by anisotropies in the electron distribution, particularly the loss-cone distribution, are considered to account for the coherent radiation.

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