Scientists by means of the SCORPIO camera of the Byurakan Astrophysical Observatory observed as a low brightness star quickly rush to life in an extremely short amount of time, becoming 15 times brighter in less than three minutes. The is catalouged as Star WX Uma. Star WX Uma, which is fairly close-by in the Ursa-major constellation, is around 15.6 light-years from Earth and is part of a dual system. It's a flare star, a normally subdued low brightness object that rarely and suddenly increases its luminosity and temperature in the period of seconds. But this effect doesn't last long. The star comes back to their usual state in approximately 10 minutes.
Image Credit: Casey Reed/NASA
One interesting fact here is, this certain change in brightness and temperature of star is so intense that the cataloging of the star plainly varies in a few seconds. In this situation, WX UMa for the moment converted from spectral type M to B. Its temperature rose from about 2,800 kelvin to about six or seven times that, like from about 2,800 kelvin to 10,000 -33,000 K. These kinds of bursts occur when variability inside the plasma of the star origins disorder in its magnetic field of the star. A researcher talking to SINC said "A magnetic reconnection then occurs, a conversion of energy from the magnetic field into kinetic energy, in order to recover the stability of the flow, much like what happens in an electric discharge,”
This kinetic energy alters into thermal energy in the higher layers of the atmosphere and the star's corona, increasing its temperature and luminosity. You can read the complete study here.
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