Intermediate-band photometry of late-type stars III. The Geneva Observatory (GO) photometric system

The Geneva Observatory (GO) photometric system for late-type stars, combined with (R,I) photometry is found to be a useful supplement to results obtained on the modified Stromgren system discussed, previously. Over the range of (R-I) from +0.22/sup M/ to +0.5/sup M/ the values of the metal abundance parameter m2 in the GO system is related to M1 similarly ordered m2 + 0.60 and the relation derived can be applied with some accuracy; [Fe/H] = αM1 - 2.50 where α = 19 - 35(R-I). The accuracy of this relation is tested with extensive lists of spectrographic abundance results for G and K stars. Some individual stars, especially metal-rich objects, observed on the GO system are also discussed. The purpose of this investigation was to examine the possibility that observations on the GO system could be used to supplement those on the modified Stromgren system, described in studies of the correlation between metal abundance and kinematics of stars