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METALLICITY OF THE YOUNG HALO GLOBULAR CLUSTER RUPRECHT 106

Medium resolution spectra of 3 stars have been used to determine the metallicity of the globular cluster Ruprecht 106. On the basis of a code developed by Cayrel et al. (1991), we computed a grid of synthetic spectra 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 variance 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.