Radio Emission from Flare Stars near the Orion Nebula

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Scientific paper

THE classical flare stars near the Sun sometimes emit large amounts of non-thermal radio energy during bright optical flares1-6. The most distant red dwarf star of this kind detected2 so far is the variable V371 Orionis at a distance of ~15 pc. We now report the probable detection of radio emission from a number of flare stars near the Orion Nebula at a distance of ~400 pc. Compared with the flare stars in the solar neighbourhood, there is a dilution factor of ~103 in intensity on account of the greater distances, but this, we believe, is largely compensated for by the much greater amounts of energy released during flares on these stars. The radio emission cannot be derived from the incoherent synchrotron mechanism but may be explained in terms of coherent plasma oscillations or amplified gyro or synchrotron emission.

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