A very intense, long-lasting radio flare on HD 32918

Details A very intense, long-lasting radio flare on HD 32918 A very intense, long-lasting radio flare on HD 32918

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.227..467s&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 227, July 15, 1987, p. 467-479.

Astronomy and Astrophysics

Astronomy

28

Cool Stars, Flare Stars, Microwave Spectra, Radiant Flux Density, Synchrotron Radiation, Brightness Temperature, Circular Polarization, Optical Thickness, Stellar Magnetic Fields, Stellar Spectrophotometry, Temporal Resolution

Scientific paper

The authors report the brightest microwave flare yet detected from an active chromosphere star. The K2 III star HD 32918 emitted 6×1012W Hz-1 at 8.4 GHz near the flare peak, and flare emission was still detectable three weeks later. The episode consisted of at least three separate flares with successively decreasing amplitudes. The 8.4-GHz emission was essentially unpolarized while the radio spectrum varied as ν1.2 near the flare peak and as ν0.6 about three weeks later. At the flare peak the estimated brightness temperature for the 8.4-GHz source, assuming a size of one stellar diameter, was ≡3×1010K. The observed flare parameters can be explained by gyrosynchrotron emission from an optically thick source. A spherically symmetrical source model in which both the magnetic field strength and the density of mildly relativistic electrons decrease outwards can explain the measured radio spectra, brightness temperatures and circular polarization.

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