ON THE RADIAL DISTRIBUTION OF HORIZONTAL BRANCH STARS IN NGC 2808

Simple item page
dc.contributor.authorIannicola, G.
dc.contributor.authorMonelli, M.
dc.contributor.authorBono, G.
dc.contributor.authorStetson, P. B.
dc.contributor.authorBuonanno, R.
dc.contributor.authorCalamida, A.
dc.contributor.authorZoccali, M.
dc.contributor.authorCaputo, F.
dc.contributor.authorCastellani, M.
dc.contributor.authorCorsi, C. E.
dc.contributor.authorDall'Ora, M.
dc.contributor.authorDi Cecco, A.
dc.contributor.authorDegl'Innocenti, S.
dc.contributor.authorFerraro, I.
dc.contributor.authorNonino, M.
dc.contributor.authorPietrinferni, A.
dc.contributor.authorPulone, L.
dc.contributor.authorMoroni, P. G. Prada
dc.contributor.authorRomaniello, M.
dc.contributor.authorSanna, N.
dc.contributor.authorWalker, A. R.
dc.date.accessioned2025-01-21T00:09:01Z
dc.date.available2025-01-21T00:09:01Z
dc.date.issued2009
dc.description.abstractWe present accurate new ultraviolet and optical BVI photometry for the Galactic globular cluster NGC 2808 based on both ground-based and archival Hubble Space telescope imagery. From this we have selected a sample of similar to 2000 Horizontal Branch (HB) stars; given the extensive wavelength range considered and the combination of both high angular resolution and wide-field photometric coverage, our sample should be minimally biased. We divide the HB stars into three radial bins and find that the relative fractions of cool, hot, and extreme HB stars do not change radically when moving from the center to the outskirts of the cluster: the difference is typically smaller than similar to 2 sigma. These results argue against the presence of strong radial differentiation among any stellar subpopulations having distinctly different helium abundances. The ratio between HB and red giant (RG) stars brighter than the ZAHB steadily increases when moving from the innermost to the outermost cluster regions. The difference is larger than similar to 4 sigma and indicates a deficiency of bright RGs in the outskirts of the cluster.
dc.fuente.origenWOS
dc.identifier.doi10.1088/0004-637X/696/2/L120
dc.identifier.eissn2041-8213
dc.identifier.issn2041-8205
dc.identifier.urihttps://doi.org/10.1088/0004-637X/696/2/L120
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/95692
dc.identifier.wosidWOS:000265531500003
dc.issue.numero2
dc.language.isoen
dc.pagina.finalL124
dc.pagina.inicioL120
dc.revistaAstrophysical journal letters
dc.rightsacceso restringido
dc.subjectglobular clusters: general
dc.subjectglobular clusters: individual (NGC2808)
dc.subjectstars: horizontal-branch
dc.titleON THE RADIAL DISTRIBUTION OF HORIZONTAL BRANCH STARS IN NGC 2808
dc.typeartículo
dc.volumen696
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
Files
Collections
Artículos de revistas