An Intense Polarized Radio Flare from AR Lac

Details An Intense Polarized Radio Flare from AR Lac An Intense Polarized Radio Flare from AR Lac

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.6602m&link_type=abstract

American Astronomical Society, 181st AAS Meeting, #66.02; Bulletin of the American Astronomical Society, Vol. 24, p.1224

Astronomy and Astrophysics

Astronomy

Scientific paper

We have detected an intense, highly circularly polarized radio flare from the close binary system AR Lacertae during a 4 day multi-wavelength observing campaign in 1991 December. The flare lasted more than 6 hours and was preceded by a strong CIV flare one day earlier. The peak circular polarization was 70%, 38%,and 39% RCP at 1.4, 4.9, and 8.4 GHz respectively, with ~ 15% LCP at 15 and 22 GHZ. The high degree of circular polarization over such a large time scale and frequency range is highly unusual compared with previously observed radio flares from RS CVn binaries. Given these unusual characteristics, it is difficult to interpret the radiation mechanism either as a result of gyrosynchrotron emission or a coherent process such as an electron cyclotron maser.

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