Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981natur.292..220s&link_type=abstract
Nature, vol. 292, July 16, 1981, p. 220, 221.
Astronomy and Astrophysics
Astronomy
10
Binary Stars, Flare Stars, Microwave Emission, Radio Sources (Astronomy), Stellar Radiation, Astronomical Photography, Brightness Temperature, Energetic Particles, Light (Visible Radiation), Light Curve, Solar Radio Bursts, Synchrotron Radiation, X Ray Sources
Scientific paper
It is pointed out that the most convincing detection of a microwave flare was made during simultaneous optical and 5-GHz observations of the dMe 4.5 flare star AT Mic on 25 October 1980. This event was notable for its long duration and the good temporal correlation between the optical and microwave intensities. Unless the dimensions of the source are very much larger than those observed for solar flares, the 5-GHz source has too great a brightness temperature to be produced by the gyrosynchrotron mechanism usually invoked for solar microwave bursts. Much higher energy particles or a coherent emission mechanism must be involved in the stellar microwave flare. The observed correlation between the optical and microwave fluxes from this flare support the theories in which nonthermal electrons are responsible for both emissions.
Nelson Graam J.
Rennie C. J.
Slee Owen Bruce
Tuohy Ian R.
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