Horizontal branch morphology in galactic globular clusters: dense environment is "a" second parameter

Details Horizontal branch morphology in galactic globular clusters: dense environment is "a" second parameter Horizontal branch morphology in galactic globular clusters: dense environment is "a" second parameter

1996-11-08

arxiv.org/abs/astro-ph/9611066v1

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.

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