A flare star is a variable star that can undergo unpredictable dramatic increases in brightness for a few minutes. It is believed that the flares on flare stars are analogous to solar flares in that they are due to magnetic reconnection in the atmospheres of the stars. The brightness increase is across the spectrum, from X rays to radio waves. The... Found on http://en.wikipedia.org/wiki/Flare_star
any star that varies in brightness, sometimes by more than one magnitude, within a few minutes. The cause is thought to be the eruption of flares ... [1 related articles] Found on http://www.britannica.com/eb/a-z/f/34
A red dwarf that displays sudden and unpredictable changes in light output lasting for a few minutes to a few hours. The flares are believed to occur in the star's chromosphere and to be similar in nature to solar flares but much more energetic. They occur irregularly, follow no predictable pattern,... Found on http://www.daviddarling.info/encyclopedia/F/flarestar.html