Flare activity of UV Ceti stars

Astronomy and Astrophysics – Astronomy

Scientific paper

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Dwarf Stars, Flare Stars, Stellar Spectrophotometry, Balmer Series, Chromosphere, Emission Spectra, Energy Spectra, H Lines, Light Curve, Photosphere, Polarimetry, Radio Emission, Stellar Coronas, Stellar Radiation, Stellar Temperature, X Ray Sources

Scientific paper

Various aspects of the flare activity of UV Ceti-type red dwarfs are reviewed. Photometry of UV Ceti stars is examined in detail along with flare light curves, the temporal distribution of flares, flare energy distributions, flare-star spectra, and radio and X-ray emission from UV Ceti stars. Nonflare activity of UV Ceti stars is discussed, emphasizing their strong emission-line spectra and small-amplitude quasi-periodic brightness variations. Several interpretations of flare observations and physical models of flare activity are critically evaluated, and similarities between solar activity and red-dwarf flare activity are outlined. Evidence for the existence of intense magnetic fields in UV Ceti stars is summarized.

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