HST Observations of High-Density Globular Clusters

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dc.creatorPiotto, G.
dc.creatorSosin, C.
dc.creatorKing, I. R.
dc.creatorDjorgovski, S. G.
dc.creatorRich, R. M.
dc.creatorDorman, B.
dc.creatorRenzini, A.
dc.creatorPhinney, S.
dc.creatorLiebert, J.
dc.date1997-01-21
dc.date.accessioned2026-07-07T02:22:45Z
dc.date.available2026-07-07T02:22:45Z
dc.descriptionIn 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.
dc.description8 pages, 1 Latex file, 7 Postscript Figures, 3 style files (epsf.sty, cupconf.sty and psfig.tex). Available at higher resolution as anonymous ftp at ftp://obelix.pd.astro.it/pub/elba/piotto.tar.gz To appear in: Advances in Stellar Evolution, ed. R. T. Rood and A. Renzini, (Cambridge U. Press: Cambridge)
dc.identifierhttps://arxiv.org/abs/astro-ph/9701152
dc.identifierhttp://arxiv.org/abs/astro-ph/9701152
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/10993
dc.subjectAstrophysics
dc.titleHST Observations of High-Density Globular Clusters
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