Quiescent microwave emission from late-type stars

Details Quiescent microwave emission from late-type stars Quiescent microwave emission from late-type stars

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apjs...90..743g&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 90, no. 2, p. 743-751

Astronomy and Astrophysics

Astrophysics

26

Late Stars, Mathematical Models, Microwaves, Particle Acceleration, Relativistic Electron Beams, Energy Distribution, Energy Transfer, Particle Energy, Stellar Coronas, Stellar Magnetic Fields

Scientific paper

A diversity of stellar classes has been detected to be prolific sources of low-level, 'quiescent' microwave radiation. This emission is, in most cases, attributed to the persistent presence of mildly relativistic electrons in the coronae. Frequent or continuous particle acceleration is required to maintain a high level of gyrosynchrotron emission. Observations relevant to our understanding of quiescent microwave emission from stars are reviewed, with emphasis on nondegenerate, late-type stars. Though the nature of the acceleration process remains unkown, a large amount of crucial information is presently available, in particular observations of timescales of slow variations, estimates of particle energies, model calculations based on spectral observations, and correlative studies with soft X-ray emission.

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