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Continuous photometric observations of the visible component of the single‐line, K2IV spectroscopic binary II Peg carried out by the  MOST  satellite during 31 consecutive days in 2008 have been analysed. On top of spot‐induced brightness modulation, 11 flares were detected of three distinct types characterized by different values of rise, decay and duration times. The flares showed a preference for occurrence at rotation phases when the most spotted hemisphere is directed to the observer, confirming previous similar reports. An attempt to detect a grazing primary minimum caused by the secondary component transiting in front of the visible star gave a negative result. The brightness variability caused by spots has been interpreted within a cold spot model. An assumption of differential rotation of the primary component gave a better fit to the light curve than a solid‐body rotation model.

Analysis of the MOST light curve of the heavily spotted K2IV component of the single‐line spectroscopic binary II Pegasi ★