Spectroscopic and photometric observations of a five-magnitude flare event on UV Ceti

Details Spectroscopic and photometric observations of a five-magnitude flare event on UV Ceti Spectroscopic and photometric observations of a five-magnitude flare event on UV Ceti

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....104.1161e&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 104, no. 3, Sept. 1992, p. 1161-1173.

Astronomy and Astrophysics

Astronomy

34

Astronomical Photometry, Bremsstrahlung, Stellar Flares, Stellar Magnitude, Stellar Spectra, Balmer Series, Spectral Resolution, Stellar Luminosity

Scientific paper

Optical observations of a 5-mag flare in the U band on UV Ceti (dM5.6e) at both spectral and temporal resolutions are presented. A strong violet continuum which cannot be reproduced solely with a thermal bremsstrahlung spectrum is seen. The energy emitted by the flare in the U band is about 5.0 x 10 exp 31 ergs. The corresponding total flare energy in white light is estimated to be 1.2 x 10 exp 32 ergs. This estimate, combined with the 700-s duration of the U-band event, yields an average white-light flare luminosity which is about 3 percent of the quiescent stellar bolometric luminosity. Strong H-alpha wings appeared after the impulsive phase. A discernible central reversal is present in both the quiescent H-alpha profile and, significantly, in the flare profile following the impulsive phase. It is suggested that the site of H-alpha flare emission is not necessarily associated with a compact, high pressure region. The flare-enhanced line emission arises from large flare volumes that are, in turn, a distinguishing feature of stellar flares of this magnitude.

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