A flare star is a
variable star which can undergo unpredictable dramatic increases in brightness for a few minutes or a few hours. The brightness increase is across the spectrum, from
X rays to
radio waves.Flare stars are dim
red dwarfs, although recent research indicates that
brown dwarfs might also be capable of flaring.The first known flare stars (V1396 Cygni and AT Microscopii) were discovered in
1924. However, the best-known flare star (
UV Ceti) was discovered in
1948, and today flare stars are sometimes known as UV Ceti variables.
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