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Title:
Microwave observations of the flare stars UV Ceti, AT Microscopii, and AU Microscopii
Authors:
Kundu, M. R.; Jackson, P. D.; White, S. M.; Melozzi, M.
Affiliation:
AA(Maryland, University, College Park), AB(Maryland, University, College Park), AC(Maryland, University, College Park), AD(Maryland, University, College Park)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 312, Jan. 15, 1987, p. 822-829. (ApJ Homepage)
Publication Date:
01/1987
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Binary Stars, Flare Stars, Microwave Spectra, Red Dwarf Stars, Stellar Spectrophotometry, Polarization Characteristics, Stellar Coronas, Stellar Mass Ejection, Stellar Models
DOI:
10.1086/164928
Bibliographic Code:
1987ApJ...312..822K

Abstract

The results of observations of three red dwarf flare star systems, UV Ceti, AT Mic, and AU Mic, made in February and March of 1985, are reported. Flaring was detected from all three systems, and quiescent emission from UV Cet and AU Mic. Models for the quiescent microwave-emitting corona of UV Cet are discussed. The gravitational scale height in current models is similar to or larger than the height of the corona, which is a striking difference from the case of the solar corona and confirms that magnetic structures are required to confine the radio-emitting corona. The role of precipitation into the chromosphere of the energetic particles in such a corona is explored, and it is shown that for plausible parameters it may be the dominant energy loss mechanism.

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