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Directivity of the radio emission from the K1 dwarf star AB DoradusWe 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.
Document ID
19950049389
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Lim, Jeremy
(Caltech, Pasadena, CA United States)
White, Stephen M.
(Univ. of Maryland, College Park, MD United States)
Nelson, Graam J.
(Australia Telescope National Facility Narrabri, Australia)
Benz, Arnold O.
(Institute of Astronomy Zurich, Switzerland)
Date Acquired
August 16, 2013
Publication Date
July 20, 1994
Publication Information
Publication: The Astrophysical Journal, Part 1
Volume: 430
Issue: 1
ISSN: 0004-637X
Subject Category
Astronomy
Accession Number
95A80988
Funding Number(s)
CONTRACT_GRANT: NSF-AST-92-17891
CONTRACT_GRANT: NSF ATM-90-13173
Distribution Limits
Public
Copyright
Other

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