Synchrotron model for a radio burst of HR 1099

Details Synchrotron model for a radio burst of HR 1099 Synchrotron model for a radio burst of HR 1099

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...143..226b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 143, no. 1, Feb. 1985, p. 226-230.

Astronomy and Astrophysics

Astrophysics

15

Flare Stars, Radio Bursts, Radio Spectra, Radio Stars, Stellar Activity, Synchrotron Radiation, Binary Stars, Electron Density (Concentration), Radiant Flux Density, Radiative Transfer, Stellar Flares, Stellar Models, Stellar Structure

Scientific paper

The radio spectrum of a long-lasting burst observed in the flaring star HR 1099, in the frequency range 1.4 GHz ≤ ν ≤ 15.5 GHz, is interpreted in terms of gyrosynchrotron radiation by mildly relativistic electrons. The observed flux at lower frequencies puts a firm lower limit on the dimension of the source, d ≡ 4-5 R*, making unlikely the hypothesis that the burst, at least at decimetric wavelengths, involves only a small portion of the stellar atmosphere. An electron density NR ∝ R-α in a uniform field B ≡ 100 G perfectly fits the observed points if α = 5.

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