VLT-UVES analysis of two giants in the bulge metal-poor globular cluster HP-1 - Analysis of two giants in HP-1

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dc.contributor.authorBarbuy, B
dc.contributor.authorZoccali, M
dc.contributor.authorOrtolani, S
dc.contributor.authorMomany, Y
dc.contributor.authorMinniti, D
dc.contributor.authorHill, V
dc.contributor.authorRenzini, A
dc.contributor.authorRich, RM
dc.contributor.authorBica, E
dc.contributor.authorPasquini, L
dc.contributor.authorYadav, RKS
dc.date.accessioned2025-01-21T01:06:16Z
dc.date.available2025-01-21T01:06:16Z
dc.date.issued2006
dc.description.abstractContext. Metal-poor globular clusters in the bulge are important tracers of early chemical evolution. HP-1 is among the six metal-poor clusters within 5. of the Galactic center, and could be the one closest to the center
dc.description.abstractAims. The main purpose of this study is the determination of metallicity and elemental ratios.
dc.description.abstractMethods. High resolution spectra of two giants of the bulge globular cluster HP-1 were obtained at the 8 m VLT UT2-Kueyen telescope with the UVES spectrograph. This is the second metal-poor globular cluster in the bulge for which a detailed abundance analysis is presented. Multiband V, I, J, H, K-s photometry was used to derive effective temperatures.
dc.description.abstractResults. The present analysis provides a metallicity [Fe/H] = - 1.00 +/- 0.2. The alpha-elements oxygen and silicon show [alpha/Fe] approximate to + 0.3, whereas magnesium, calcium and titanium show solar ratios. A proper motion analysis indicates that the two stars are cluster members.
dc.description.abstractConclusions. The metallicity is unexpected for a blue Horizontal Branch (BHB) cluster. HP-1 is the first known cluster with such a high metallicity combined with a BHB and a steep Red Giant Branch (RGB). Together with NGC 6388 and NGC 6441 of [Fe/H] similar to - 0.6 it would be third with such characteristics, but it diffs from them, since these two other clusters have also a populous Red HB, and a normal slope of the RGB for their metallicity, which is not the case of HP-1.
dc.fuente.origenWOS
dc.identifier.doi10.1051/0004-6361:20054288
dc.identifier.issn1432-0746
dc.identifier.urihttps://doi.org/10.1051/0004-6361:20054288
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/96122
dc.identifier.wosidWOS:000235991600035
dc.issue.numero1
dc.language.isoen
dc.pagina.finalU143
dc.pagina.inicio349
dc.revistaAstronomy & astrophysics
dc.rightsacceso restringido
dc.subjectGalaxy : bulge
dc.subjectGalaxy : globular clusters : individual : HP-1
dc.subjectstars : abundances
dc.subjectstars : Hertzsprung-Russell (HR) and C-M diagrams
dc.titleVLT-UVES analysis of two giants in the bulge metal-poor globular cluster HP-1 - Analysis of two giants in HP-1
dc.typeartículo
dc.volumen449
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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