Horizontal Branch Morphology and the 2nd Parameter Problem
Pecci, F. Fusi · Bellazzini, M. · Ferraro, F. R. · Buonanno, R. · Corsi, C.
Original · EN
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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