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Table 1: The number of individual $\Delta a$ measurements from the given reference. The used filter systems are according to Table 2.
Table 2: Filter systems used for the $\Delta a$ measurements, the units are Å.
Table 3: Limits in mmag for detecting the individual groups of objects. For example 49% of all CP1 stars can be detected with a 3 $\sigma$ limit of +5 mmag. In addition, the mean group $\overline {\Delta a}$ , the maximum values for group members $\Delta a_{\rm m}$ , and the number N of well-established members for the analysis are listed.
Table 4: Confirmed chemically peculiar stars from Renson (1991), the type of peculiarity was taken from the literature. The complete table is only available in electronic form.
Table 5: A comparison of the detection capability of the $\Delta a$ and Geneva $\Delta (V1 - G)$ , as well as Zindices for the objects with available Geneva 7-color photometry. No objects of the CP1 and $\lambda$ Bootis group are within the range of valid Z values (defined for stars hotter than A0). The results are shown graphically in Fig. 5.
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Table 4: Confirmed chemically peculiar stars from Renson (1991), the type of peculiarity was taken from the literature. The complete table is only available in electronic form.