Directivity of the radio emission from the K1 dwarf star AB Doradus

Details Directivity of the radio emission from the K1 dwarf star AB Doradus Directivity of the radio emission from the K1 dwarf star AB Doradus

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...430..332l&link_type=abstract

The Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 430, no. 1, p. 332-341

Astronomy and Astrophysics

Astronomy

28

Dwarf Stars, K Stars, Radio Astronomy, Radio Emission, Stellar Models, Stellar Spectra, Astronomical Spectroscopy, Circular Polarization, Starspots, Stellar Rotation

Scientific paper

We present measurements of the spectrum and polarization of the flaring radio emission from the K1 dwarf star AB Doradus, together with previously reported single frequency measurements (with no polarization information) on 3 other days. On all 4 days spanning a 6 month period, the emission was strong and, when folded with the stellar rotation period, showed similar time variations with two prominant peaks at phase 0.35 and 0.75. These peaks coincide in longitude with two large starspots identified from the stellar optical light curve and have half-powe widths as small as 0.1 rotations and no larger than 0.2 rotations. The modulated emission shows no measurable circular polarization, and its two peaks have different turnover frequencies.

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