Homogeneous age dating of 55 Galactic globular clusters. Clues to the Galaxy formation mechanisms

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dc.creatorSalaris, M.
dc.creatorWeiss, A.
dc.date2002-04-24
dc.date.accessioned2026-07-07T11:08:05Z
dc.date.available2026-07-07T11:08:05Z
dc.descriptionWe present homogeneous age determinations for a large sample of 55 Galactic globular clusters, which constitute about 30% of the total Galactic population. A study of their age distribution reveals that all clusters from the most metal poor ones up to intermediate metallicities are coeval, whereas at higher [Fe/H] an age spread exists, together with an age-metallicity relationship. At the same time, all clusters within a certain galactocentric distance appear coeval, whereas an age spread is present further away from the Galactic centre, without any correlation with distance. The precise value of [Fe/H] and galactocentric distance for the onset of the age spread and the slope of the age-metallicity relationship are strongly affected by the as yet uncertain [Fe/H] scale. We discuss how differences in the adopted [Fe/H] scale and cluster sample size may explain discrepant results about the clusters age distribution reached by different authors. Taking advantage of the large number of objects included in our sample, we also tested the possibility that age is the global second parameter which determines the Horizontal Branch morphology, and found indications that age could explain the global behaviour of the second parameter effect.
dc.description12 pages, 11 figures, A&A accepted
dc.identifierhttps://arxiv.org/abs/astro-ph/0204410
dc.identifierhttp://arxiv.org/abs/astro-ph/0204410
dc.identifierAstron.Astrophys.388:492-503,2002
dc.identifierdoi:10.1051/0004-6361:20020554
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/190020
dc.subjectAstrophysics
dc.titleHomogeneous age dating of 55 Galactic globular clusters. Clues to the Galaxy formation mechanisms
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