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First detection of nonflare microwave emissions from the coronae of single late-type dwarf starsResults are presented of a search for nonflare microwave radiation from the coronae of nearby late-type dwarf stars comparable to the sun: single stars without evidence for either a large wind or circumstellar envelope. The observing program consisted of flux measurements of six stars over a 24-h period with the VLA in the C configuration at a wavelength of 6 cm with 50 MHz bandwidth. Positive detections at 6 cm were made for Chi 1 Ori (0.6 mJy) and the flare star UV Cet (1.55 mJy), and upper limits were obtained for the stars Pi 1 UMa, Xi Boo A, 70 Oph A and Epsilon Eri. It is suggested that Chi 1 Ori, and possibly UV Cet, represent the first detected members of a new class of radio sources which are driven by gyroresonance emission, i.e. cyclotron emission from nonrelativistic Maxwellian electrons.
Document ID
19820031721
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Gary, D. E. (Colorado, University Boulder, CO, United States)
Linsky, J. L. (Joint Institute for Laboratory Astrophysics; National Bureau of Standards, Quantum Physics Div., Boulder CO, United States)
Date Acquired
August 10, 2013
Publication Date
November 1, 1981
Publication Information
Publication: Astrophysical Journal
Subject Category
ASTROPHYSICS
Funding Number(s)
CONTRACT_GRANT: NSG-9287
CONTRACT_GRANT: NGL-06-003-057
Distribution Limits
Public
Copyright
Other