  Stars of Pulkovo observatory program are observed on 65-cm refractor during
many years for study their positions and movement. We represent example of two
visual binary stars, for which orbits and masses of components were determined,
and two astrometric stars, for which masses of their unseen companions have
been estimated. The first stars are: ADS 14636 (61 Cygni) and ADS 7251 and
others are: Gliese 623 and ADS 8035 (Alpha UMa). The direct astrometric methods
were used for estimation of mass-ratio and masses.
