Abstract
We present a new observational speckle interferometric study of stars with parallaxes larger than 200 milliarcsecond (mas) from the Tycho Main Catalogue. According to this catalogue, there are more than 5000 objects meeting this criterion. Relatively small telescopes can be effectively used for this purpose since they can reach the Rayleigh resolution limit R = 1.22 lambda D. For instance, the resolution of a 2m telescope in the V band is 0.055arcsec . For 5 pc that corresponds to 0.275 au. In July 2014 we began speckle observations of stars with large parallaxes from the Tycho Main Catalogue.
