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CCD astrometry and UBV photometry of visual binaries. II. Visual double stars with mainly G - type primaries and relatively small angular separation
Differences Delta V of magnitude and Delta (B-V) and Delta (U-B)colours, as well as separations and position angles of 42 relativelyclose double stars are presented. The selection criteria of our sampleare: the relatively small separation (between 2.5 and 5 arcseconds),magnitude difference under 1.25 mag, and mainly G-type primaries. TheCCD observations, performed at the 90 cm Dutch telescope at ESO, weremade using the Bessel U, B and V filters; the astrometry was done in theV filter only. From the analysis of the photometric data we concludethat 16 binaries in our sample have components with practically the sameT_eff, since they have almost the same colours; one binary hascomponents with identical characteristics. We also note the goodinternal accuracy of the astrometric CCD measurements. Based onobservations made at ESO La Silla, Chile.
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