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Differences of magnitude and and colours, as well as separations and position angles of 42 relatively close double stars are presented. The selection criteria of our sample are: the relatively small separation (between 2.5 and 5 arcseconds), magnitude difference under 1.25 mag, and mainly G-type primaries. The CCD observations, performed at the 90 cm Dutch telescope at ESO, were made using the Bessel U , B and V filters; the astrometry was done in the V filter only. From the analysis of the photometric data we conclude that 16 binaries in our sample have components with practically the same T eff , since they have almost the same colours; one binary has components with identical characteristics. We also note the good internal accuracy of the astrometric CCD measurements.

CCD astrometry and UBV photometry of visual binaries