Infrared photometry and CaT spectroscopy of globular cluster M 28 (NGC 6626)

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dc.contributor.authorMoni Bidin, C.
dc.contributor.authorMauro, F.
dc.contributor.authorContreras Ramos, R.
dc.contributor.authorZoccali, M.
dc.contributor.authorReinarz, Y.
dc.contributor.authorMoyano, M.
dc.contributor.authorGonzalez-Diaz, D.
dc.contributor.authorVillanova, S.
dc.contributor.authorCarraro, G.
dc.contributor.authorBorissova, J.
dc.contributor.authorChene, A-N
dc.contributor.authorCohen, R. E.
dc.contributor.authorGeisler, D.
dc.contributor.authorKurtev, R.
dc.contributor.authorMinniti, D.
dc.date.accessioned2025-01-20T23:51:50Z
dc.date.available2025-01-20T23:51:50Z
dc.date.issued2021
dc.description.abstractContext. Recent studies show that the inner Galactic regions host genuine bulge globular clusters, but also halo intruders, complex remnants of primordial building blocks, and objects likely accreted during major merging events.Aims. In this study we focus on the properties of M 28, a very old and massive cluster currently located in the Galactic bulge.Methods. We analysed wide-field infrared photometry collected by the VVV survey, VVV proper motions, and intermediate-resolution spectra in the calcium triplet range for 113 targets in the cluster area.Results. Our results in general confirm previous estimates of the cluster properties available in the literature. We find no evidence of differences in metallicity between cluster stars, setting an upper limit of
dc.description.abstractDelta [Fe/H] < 0.08
dc.description.abstractDelta Fe H < 0.08
dc.description.abstractdex to any internal inhomogeneity. We confirm that M 28 is one of the oldest objects in the Galactic bulge (13-14 Gyr). From this result and the literature data, we find evidence of a weak age-metallicity relation among bulge globular clusters that suggests formation and chemical enrichment. In addition, wide-field density maps show that M 28 is tidally stressed and that it is losing mass into the general bulge field.Conclusions. Our study indicates that M 28 is a genuine bulge globular cluster, but its very old age and its mass loss suggest that this cluster could be the remnant of a larger structure, possibly a primeval bulge building block.
dc.fuente.origenWOS
dc.identifier.doi10.1051/0004-6361/202039192
dc.identifier.eissn1432-0746
dc.identifier.issn0004-6361
dc.identifier.urihttps://doi.org/10.1051/0004-6361/202039192
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/94862
dc.identifier.wosidWOS:000638124500004
dc.language.isoen
dc.revistaAstronomy & astrophysics
dc.rightsacceso restringido
dc.subjectGalaxy: bulge
dc.subjectglobular clusters: individual: M28
dc.subjectglobular clusters: general
dc.titleInfrared photometry and CaT spectroscopy of globular cluster M 28 (NGC 6626)
dc.typeartículo
dc.volumen648
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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