Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...272l..15l&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 272, Sept. 1, 1983, p. L15-L18.
Astronomy and Astrophysics
Astronomy
47
Dwarf Stars, Flare Stars, Main Sequence Stars, Radio Sources (Astronomy), Radio Stars, Stellar Spectrophotometry, Variable Stars, Circular Polarization, Late Stars, Periodic Variations, Radiant Flux Density, Solar Radiation, Stellar Coronas
Scientific paper
A rapid sequence of highly polarized spikes was observed during the gradual rise of a longer lasting event in an Arecibo Observatory study of a radio burst at 1400 MHz from the main sequence radio star AD Leo. The maximum flux density of the spikes was 130 mJy, and they had rise times of less than about 200 msec. The rise times provide an upper limit to the linear size of the emitter of 6 billion cm, and an area of less than 0.03 of the star's surface area is inferred, for a spike brightness temperature of more than about 10 to the 13th K. The high brightness temperatures and high degrees of circular polarization are explained in terms of electron-cyclotron maser emission at the second harmonic of the gyrofrequency, in longitudinal magnetic fields of about 250 G.
Bookbinder Jay
Davis Martin
Golub Leon
Lang Kenneth R.
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