 The first studies were made using the high dispersion spectrograph on the Subaru telescope in Hawaii.Some 50 apparently solar-type stars, known from the Kepler observations to show superflare activity, have been examined in detail.Of these, only 16 showed evidence of being visual or spectroscopic binaries; these were excluded since close binaries are frequently active, while in the case of visual binaries there is the chance of activity taking place on the companion.