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An unusual microwave flare with 56 second oscillations on the M dwarf L726-8 AUsing the VLA, an unusual flare event has been observed on L726-8 A (dM5.5e), the primary star in the M dwarf system containing the prototype flare star UV Cet. This flare had a peak flux of 8 mJy at 6 cm and a corresponding brightness temperature greater than 10 to the 10th K, was almost entirely right-hand circularly polarized, showed large flux variations on the 10 s time resolution of the VLA, and exhibited quasi-periodic oscillations with a period of about 56 + or - 5 s. While periodic flux variations have been detected during solar flares and RS CVn type stellar flares, this is apparently the first detection of periodicity in microwaves from M dwarf stars. It is proposed that the observed radiation was due to maser action, probably an electron maser, and that the energy release mechanism was modulated.
Document ID
19830035814
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Gary, D. E.
(Colorado Univ. Boulder, CO, United States)
Dulk, G. A.
(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 11, 2013
Publication Date
December 15, 1982
Publication Information
Publication: Astrophysical Journal
Subject Category
Astrophysics
Accession Number
83A17032
Funding Number(s)
CONTRACT_GRANT: NAGW-91
CONTRACT_GRANT: NGL-06-003-057
CONTRACT_GRANT: NSG-7287
CONTRACT_GRANT: NSG-9287
Distribution Limits
Public
Copyright
Other

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