We present optical observations of a 5 mag flare in the U band on UV Ceti (dM5.6e) at both high spectral and temporal resolutions. A strong violet continuum is seen which cannot be reproduced solely with a thermal bremsstrahlung spectrum. The energy emitted by the flare in the U band is approximately 5.0 x 10 to the 31st power ergs. The corresponding total flare energy in white light is estimated ...
Flare stars are late-type emission-line main sequence stars which exhibit random and rapid increases in luminosity. All dwarf M stars thus far observed in the blue-visible and near ultraviolet emit Ca II H and K and Mg II h and k arising from their low to midchromospheres, respectively. However, only those with enhanced chromospheric and transition region densities emit Ha (Distinguishing dMe from dM) as well as a host of ...
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