HB morphology and the Second Parameter Effect: Faint Stars in a big game
Pecci, Flavio Fusi · Bellazzini, Michele
Original · EN
We schematically review some of the main steps in the study of the Horizontal Branch Morphology in Galactic Globular Clusters. Since the first realization of the existence of the so-called Second Parameter Problem (2nd-P) up to now, one could perhaps see a sort of circular path. Actually, many candidate 2nd-P's were proposed during the early '70s, age has been the top-scored 2nd-P during the late '80s, and we are now back to even more candidates, including also possible intriguing combinations of some of them.
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