UBV photoelectric catalogue (1986). II. Analysis of the data.

The UBV photoelectric data of the stars presenting several entries in the 1986 edition of the UBV catalog have been systematically intercompared, and this paper presents a discussion of the stars for which discrepancies larger than 0.2 mag were found. Thirty-six probably variable stars have been detected, among which 18 are Be stars. Sixty further stars present differences in the V magnitude larger than 0.2 mag. Sixteen stars already appear in the NSV catalog. Although many problems are probably due to poor observations, new (eclipsing) variable stars may be found in this sample. Complete disagreement is found between the values published from two independent sources in 34 cases. A first analysis of the quality of the UBV data shows that 65 percent of the differences in the V magnitude and in U-B color, for respectively 11,500 and 7200 stars with two sources of data, are smaller than 0.04. The scatter on the B-V index appears to be smaller, since the same percentage reaches 79 percent.