Physical and Optical Visual Double Stars of the North-Polar Area as Obtained by Photographic Observations at Pulkovo

Abstract

The subject of this paper is the results of photografic observations of the visual double stars of the North-polar area. These observations are a part of the Pulkovo’s program for the systematic observations of the components relative positions of the visual double stars situated in the North-polar area [2]. A northern location of Pulkovo Observatory gives favourable conditions for observations of stars in the North-polar area, which cannot be considered exhaustively investigated so far. Within this part of the program the main attention has been paid to the physical double stars situated close to the Sun, which are the most perspective for a determination of their orbits by the method of apparent motions parameters [1].