Abundances in globular cluster red giants. V - The metal-rich globular clusters

Abstract

Low-dispersion scans of stars in eight metal-rich globular clusters are used to estimate the metallicity scale of the metal rich clusters relative to 47 Tue. Various arguments are presented which establish [Fe/H]_⊙= —0.6 to —0.8 dex for 47 Tue. A new set of high-resolution, high-precision CCD spectra demonstrates that systematic errors have occurred in the placement of the continuum in previously published echelle analyses of metal-rich clusters. Reconciliation of analyses of low-dispersion scans and high-dispersion equivalent widths can be achieved with [Fe/H]_⊙= —0.7+ 0.1 dex for 47 Tue. This value is in good agreement with Bell and Gustafsson's scale established via photometric indices computed from synthetic spectra and model atmospheres. The metal-rich globular clusters reach the solar abundance.

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