Flare activity have been detected during photometric monitoring
of close visual binary star COU 14 (=13 Peg =HD 207652) suspected
in variability.
The spectral data indicate that the main component of the
system may be classified as F2 IV while secondary is in all probability
an early G type dwarf.
Two flares with amplitudes 0.31 and 0.33mag in B and V colors,
respectively as well as 4 flares of smaler intensity in U color are
observed. Both the light curves and duration of these flares (all less
than 10min.) indicate that we deal with UV Ceti type activity which is
quite unexpected phenomenon for the star with such spectral
characteristics. The brightness variations of the system in longer
timescales of few days are also detected.
It is suggested that both flare activity and slow brightness variations may be attributed to the faint secondary component which might be T Tau type star probably with weak emission lines. Nevertheless, due to low brightness latter does not contribute substantially to the composite spectrum of COU 14. For the first time flare activity is detected in binary system with perfectly well determined orbital parameters which should allow furthermore to compare its astrophysical and dynamical properties.