Astronomy and Astrophysics – Astrophysics
Scientific paper
1996-11-08
Astronomy and Astrophysics
Astrophysics
14 pages, AASTEX latex, plus 3 .eps figures automatically enclosed, needs the latex-macros aj_pt4.sty and epsf.sty -- To appea
Scientific paper
10.1086/118289
The Horizontal Branch (HB) morphology in the color -- magnitude diagram of the Galactic globular clusters depends on many factors, and it is now firmly established that the so-called Second Parameter is not just the cluster age as claimed for several years. As a part of a wider program devoted to the search for the physical processes driving the Horizontal Branch Morphology, we re-address here the problem of the extension of blue HB tails by introducing a new quantitative observable, B2/B+R+V where B2={Number of HB stars with (B-V)_0<-0.02}. We demonstrate that the environmental conditions within a cluster clearly affect its HB morphology, in the sense that, in general, the higher the cluster central density the higher is the relative number of stars populating the most blue region of its HB.
Bellazzini Michele
Buonanno Roberto
Corsi Chiara
Ferraro Francesco R.
Fusi Pecci Flavio
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