Narrow-band, slowly varying decimetric radiation from the dwarf M flare star YZ Canis Minoris

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Decimeter Waves, Dwarf Stars, Flare Stars, M Stars, Periodic Variations, Stellar Radiation, Coherent Radiation, Electron Cyclotron Heating, Interstellar Masers, Narrowband, Nonthermal Radiation, Plasma Radiation, Solar Radio Bursts

Scientific paper

Observations of slowly varying radiation from the dwarf M star YZ Canis Minoris with a maximum flux density of 20 mJy and narrow-band frequency structure at frequencies near 1465 MHz are presented. Possible explanations for this radiation are examined. Thermal gyroresonant radiation would require impossibly large coronal loops and magnetic field strengths. The narrow-band structure cannot be explained by continuum emission processes such as thermal bremsstrahlung, thermal gyroresonant radiation, or nonthermal gyrosynchrotron radiation. Coherent burst mechanisms seem to be required.

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