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- W1714241504 abstract "In this paper we present preliminary results from our HST project aimed at exploring the connection between the stellar dynamics and stellar evolution in the cores of high-density globular clusters. We illustrate the discovery of horizontal branches (HB) with extended blue tails in the very metal rich globular clusters NGC 6388 ([Fe/H]=-0.6) and NGC 6441 ([Fe/H]=-0.5), and of a four-mode horizontal branch in NGC 2808. We briefly summarize the possible causes of these anomalies, which might be a signature of mass-loss processes,subtle composition variations, or dynamical effects. The existence of blue HBs in metal rich clusters and of significant narrow gaps between clumps on the HB are a challenge for the theoretical models. The composite color-magnitude diagram and luminosity function of 878 blue stragglers in our sample of 13 galactic globular clusters are also presented and briefly discussed." @default.
- W1714241504 created "2016-06-24" @default.
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- W1714241504 date "1997-01-21" @default.
- W1714241504 modified "2023-09-27" @default.
- W1714241504 title "HST Observations of High-Density Globular Clusters" @default.
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