Variations of the H-beta emission line during a large flare on UV Ceti

Astronomy and Astrophysics – Astronomy

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Astronomical Photometry, Dwarf Stars, H Beta Line, Stellar Luminosity, Stellar Spectra, Early Stars, Electrophotometry, Energy Transfer, Flared Bodies, Flares, Optical Scanners, Photosensitivity, Stellar Spectrophotometry

Scientific paper

Simultaneous high-speed photometry and photoelectric scanner observations of the H-beta line were obtained for five flare events, one a major flare on UV Ceti. The relative increase in the intensity of the H-beta line during the large flare was much greater than the relative continuum rise as measured both by the scanner and by broad-band photometric observations. In H-beta, the flare lasted nearly 30 times as long as in the continuum. Peak intensity in the H-beta line occurred later than the continuum maximum. The possibility of using emission-line observations to detect flare activity on early spectral-type stars (dK-dG) is discussed. Some speculations on the mechanism of flare production are indulged.

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