On the effects of cluster density and concentration on the horizontal branch morphology - The origin of the blue tails

Details On the effects of cluster density and concentration on the horizontal branch morphology - The origin of the blue tails On the effects of cluster density and concentration on the horizontal branch morphology - The origin of the blue tails

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....105.1145f&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 105, no. 3, p. 1145-1168.

Astronomy and Astrophysics

Astronomy

188

Galactic Clusters, Globular Clusters, Horizontal Branch Stars, Metallicity, Morphology, Stellar Evolution, Chemical Composition, Color-Magnitude Diagram, Multivariate Statistical Analysis, Stellar Mass, Stellar Mass Ejection

Scientific paper

Possible relationships between horizontal branch (HB) morphology in Galactic globular clusters and the cluster structure and dynamical evolution are investigated. New HB observables are defined and determined using a theoretical framework deduced from HB models. Data for 53 Galactic globular clusters are used to obtain correlations between the observables. It is found that the net length of the HB and the presence and extent of blue tails in particular are correlated with the cluster density and concentrations, in the sense of more concentrated or denser clusters having bluer and longer HB morphologies. This effect is especially strong for the intermediate metallicity clusters. Thus, the cluster environment can affect the stellar evolution leading to the HB and therefore the HB morphology. This result is interpreted in terms of an enhanced mass removal from the HB progenitors.

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