5 The main table

Table 4 contains the result of the 1959 and part of the 1960 campaigns. The stars are denoted by their HD number, or BD number if north of $\delta = -23^\circ$, or by their Co D number if south of this limit. For the close visual binaries HD 36861/36862, HD 120709/120710 and HD 147934/147935 the intensities and magnitudes given are the combined values for the pair.

Following a suggestion by the referee, and with a view towards making Table 4 more useful, Dr. J. Lub at Leiden Observatory added in the third column a simple code indicating whether the data were taken in 1959, 1960 or both years: 10, 01 or 11 respectively. He also provided a further two columns in which the V and (B-V) colours on the Johnson system are given, based upon the transformations published by WW77.

Acknowledgements

The authors acknowledge with thanks Mr. L. Maitimo's share in the reduction of the observations. Many thanks are due to Dr. A.M. van Genderen for several useful remarks on an earlier version of this paper. Many thanks are due to an unknown refeee. His remarks led to a considerable improvement of this paper.

During the preparation of this paper Mrs. J.H. Walraven died. It seems here a fitting place to emphasize how essential her contribution was to the many observational and instrumental projects of her husband, the second author of this paper. She took an active part in the construction of optical instruments by grinding and polishing mirrors and lenses, she

assisted in the observations and took a major share in their reductions. Without her such a large production of observations would not have been possible.