Horizontal Branch Morphology and the 2nd Parameter Problem
F. Fusi Pecci, M. Bellazzini, F. R. Ferraro, R. Buonanno, C. Corsi
Abstract
We review the most outstanding issues related to the study of the morphology of the Horizontal Branch (HB) in the Color-Magnitude Diagrams of Galactic Globular Clusters and its use as age indicator. It is definitely demonstrated (see also Bolte, this meeting) that age cannot be the only 2nd-P driving the HB morphology. Other candidate 2nd-Ps are briefly examined, with special attention to the possible influence of cluster stellar density.
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