The Calibration of the CaII triplet with Bulge Globular Clusters

Details The Calibration of the CaII triplet with Bulge Globular Clusters The Calibration of the CaII triplet with Bulge Globular Clusters

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003noao.prop...48g&link_type=abstract

NOAO Proposal ID #2003A-0048

Physics

Scientific paper

We propose to obtain spectra of a sample of metal-rich globular clusters in the Galactic bulge, to perform an accurate calibration of the line strength of the Ca II triplet (CaT, at ~ 8600 Å) of high-metallicity stellar population models. Such calibration has not yet been performed in the literature, though it is required to understand the chemical evolution of elliptical galaxies and bulges. We recently found that metallicities measured in ellipticals using the CaT index are much lower than those derived from optical indices, e.g., Magnesium. This discrepancy is particularly puzzling since both Magnesium and Calcium are (alpha)-elements and should be produced by the same stellar progenitors. Moreover elliptical galaxies are known to have enhanced Magnesium with respect to solar element ratios. The data we suggest to acquire will allow us a direct check of the relation of the CaT index with the Calcium abundance near Z_&sun;, since the spectroscopic Calcium abundance is independently known from high- resolution spectroscopy of the target GCs.

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