Ages of Galactic Globular Clusters from the New Yale Isochrones
Brian Chaboyer, P. Demarque, D. B. Guenther, M. H. Pinsonneault, L. L. Pinsonneault
Abstract
A new grid of theoretical isochrones based on the Yale stellar evolution code using the OPAL and Kurucz opacities has been constructed. The grid of isochrones spans a wide range of metallicities, helium abundances and masses. The construction of the isochrones is described and the isochrones are compared to galactic globular cluster observations. A solar calibrated mixing length (α= 1.7) yields a good fit to globular cluster colour-magnitude diagrams. Ages for 40 globular clusters are determined using the method and the formation of the halo is discussed.
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