Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...405l..33l&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 405, no. 1, p. L33-L37.
Astronomy and Astrophysics
Astrophysics
23
Dwarf Stars, M Stars, Radio Emission, Stellar Evolution, Stellar Radiation, Stellar Rotation, Circular Polarization, Flare Stars, Magnetic Fields, Polarity, Radiant Flux Density
Scientific paper
The discovery of intense radio emission from the dM4e star Rositter 137B is reported. The star is rapidly rotating and is believed to have an age of approximately 5-8 x 10 exp 7 yr. The observed radio emission suggests that older dMe flare stars may have evolved through a stage of even higher radio activity than their present levels. This may indicate that that the magnetic dynamo of M dwarf stars decays in strength well before reaching the zero-age main sequence. Alternatively, younger and/or more rapidly rotating M dwarf stars may be able to more efficiently convert magnetic energy to radio energy. Rst 137B displays steady quiescent emission which appears to be circularly polarized. This observation may provide some indication of the magnetoionic mode of coherent stellar microwave flares. The classification of RST 137B among known quiescent stellar radio sources is suggested.
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