3 The standard stars

The values for the standard stars, derived in this investigation, are collected in Table 1, together with their (internal) mean errors. The average value of the standard deviation of one observation is 0.008 for V and 0.004 for the colour indices. All quantities here are expressed in logarithms of intensity, in conformity with the usual practice in the Walraven VBLUW colour system. In Table 1 the symbol n denotes the number of observations used; the other column headings are self-explanatory. Comparisons with standard star values given in other publications show reasonable agreement, with the exception that the derived intensity of HD 210934 in the U channel is approximately 0.015 too bright in 1959.

  

Table 1: Adopted values for the primary standards, with their mean errors