ON THE Δ<i>V</i><sub>HB</sub><SUP>bump</SUP> PARAMETER IN GLOBULAR CLUSTERS

Simple item page
dc.contributor.authorDi Cecco, A.
dc.contributor.authorBono, G.
dc.contributor.authorStetson, P. B.
dc.contributor.authorPietrinferni, A.
dc.contributor.authorBecucci, R.
dc.contributor.authorCassisi, S.
dc.contributor.authorDegl'Innocenti, S.
dc.contributor.authorIannicola, G.
dc.contributor.authorMoroni, P. G. Prada
dc.contributor.authorBuonanno, R.
dc.contributor.authorCalamida, A.
dc.contributor.authorCaputo, F.
dc.contributor.authorCastellani, M.
dc.contributor.authorCorsi, C. E.
dc.contributor.authorFerraro, I.
dc.contributor.authorDall'Ora, M.
dc.contributor.authorMonelli, M.
dc.contributor.authorNonino, M.
dc.contributor.authorPiersimoni, A. M.
dc.contributor.authorPulone, L.
dc.contributor.authorRomaniello, M.
dc.contributor.authorSalaris, M.
dc.contributor.authorWalker, A. R.
dc.contributor.authorZoccali, M.
dc.date.accessioned2025-01-21T00:06:20Z
dc.date.available2025-01-21T00:06:20Z
dc.date.issued2010
dc.description.abstractWe present new empirical estimates of the del V-HB(bump) parameter for 15 Galactic globular clusters (GGCs) using accurate and homogeneous ground-based optical data. Together with similar evaluations available in the literature, we ended up with a sample of 62 GGCs covering a very broad range in metal content (-2.16 dex <= [M/H] <= -0.58 dex). Adopting the homogeneous metallicity scale provided either by Kraft & Ivans or by Carretta et al., we found that the observed del V-HB(bump) parameters are larger than predicted. In the metal-poor regime ([M/H] less than or similar to -1.7, -1.6 dex) 40% of GCs show discrepancies of 2s (approximate to 0.40 mag) or more. Evolutionary models that account either for alpha- and CNO-enhancement or for helium enhancement do not alleviate the discrepancy between theory and observations. The outcome is the same if we use the new solar heavy-element mixture. The comparison between alpha- and CNO-enhanced evolutionary models and observations in the Carretta et al. metallicity scale also indicates that observed del V-HB(bump) parameters, in themetal- rich regime ([M/H] >= 0), might be systematically smaller than predicted.
dc.fuente.origenWOS
dc.identifier.doi10.1088/0004-637X/712/1/527
dc.identifier.eissn1538-4357
dc.identifier.issn0004-637X
dc.identifier.urihttps://doi.org/10.1088/0004-637X/712/1/527
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/95585
dc.identifier.wosidWOS:000275222900047
dc.issue.numero1
dc.language.isoen
dc.pagina.final535
dc.pagina.inicio527
dc.revistaAstrophysical journal
dc.rightsacceso restringido
dc.subjectglobular clusters: general
dc.subjectstars: evolution
dc.subjectstars: horizontal-branch
dc.subjectstars: Population II
dc.titleON THE Δ<i>V</i><sub>HB</sub><SUP>bump</SUP> PARAMETER IN GLOBULAR CLUSTERS
dc.typeartículo
dc.volumen712
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
Files
Collections
Artículos de revistas