METALLICITY OF THE YOUNG HALO GLOBULAR-CLUSTER RUPRECHT-106

Medium resolution spectra of 3 stars have been used to determine the m etallicity of the globular cluster Ruprecht 106. On the basis of a cod e developed by Cayrel et al. (1991), we computed a grid of synthetic s pectra in order to derive the metallicity of these stars. We found an abundance of [Fe/H] = -1.6 +/- 0.25 which, although not formally at va riance with the estimate of metallicity based on the slope of the RGB ([Fe/H] = -1.9 +/- 0.2) raises some puzzling questions concerning the true metallicity of this cluster.