Appendix

In the following both the observing log (Table 1) and the photometric data (Table 2) are listed.

Table 1 gives the numbers of the runs, starting and end dates, the total number of nights and the observers. Their abreviations B, F, P, R, and V stand for Blest, Faúndez-Abans, Perez, Roman, and Vogt, respectively.

  

Table 1: Observing log

Table 2 on the following pages lists the HR and HD numbers, the run (see Table 1) in which the observations were obtained (sometimes several observations per run and/or on several runs), a, $\Delta a$ absolute and expressed in units of the average standard deviation of normal stars from the normality line, b-y and its dereddened quantity (b-y)₀, m₁, the spectral types from the BS Catalogue and the Michigan spectral survey (where available), then a column which indicates whether the object was used for the construction of the normality line ("N'') or entered the group of double stars ("D''), and finally the peculiarity group to which the star belongs (Preston's CP1-4, $\lambda$ Boo, $\delta$ Del, emission line objects "E'', supergiants "SG'' and a Barium star "Ba'').