The enigmatic globular cluster UKS 1 obscured by the bulge: H -band discovery of nitrogen-enhanced stars

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dc.contributor.authorFernández-Trincado, José G.
dc.contributor.authorMinniti, Dante
dc.contributor.authorBeers, Timothy C.
dc.contributor.authorVillanova, Sandro
dc.contributor.authorGeisler, Doug
dc.contributor.authorSouza, Stefano O.
dc.contributor.authorSmith, Leigh C.
dc.contributor.authorPlacco, Vinicius M.
dc.contributor.authorVieira, Katherine
dc.contributor.authorPérez-Villegas, Angeles
dc.contributor.authorBarbuy, Beatriz
dc.contributor.authorAlves-Brito, Alan
dc.contributor.authorMoni Bidin, Christian
dc.contributor.authorAlonso-García, Javier
dc.contributor.authorTang, Baitian
dc.contributor.authorPalma, Tali
dc.date.accessioned2023-11-10T17:05:48Z
dc.date.available2023-11-10T17:05:48Z
dc.date.issued2020-11-01
dc.descriptionIndexación: Scopuses
dc.description.abstractThe presence of nitrogen-enriched stars in globular clusters provides key evidence for multiple stellar populations (MPs), as has been demonstrated with globular cluster spectroscopic data towards the bulge, disk, and halo. In this work, we employ the VVV Infrared Astrometric Catalogue (VIRAC) and the DR16 SDSS-IV release of the APOGEE survey to provide the first detailed spectroscopic study of the bulge globular cluster UKS 1. Based on these data, a sample of six selected cluster members was studied. We find the mean metallicity of UKS 1 to be [Fe/H] = -0.98 ± 0.11, considerably more metal-poor than previously reported, and a negligible metallicity scatter, typical of that observed by APOGEE in other Galactic globular clusters. In addition, we find a mean radial velocity of 66.1 ± 12.9 km s-1, which is in good agreement with literature values, within 1σ. By selecting stars in the VIRAC catalogue towards UKS 1, we also measure a mean proper motion of (μαcos(δ), μδ) = (-2.77 ± 0.23, -2.43 ± 0.16) mas yr-1. We find strong evidence for the presence of MPs in UKS 1, since four out of the six giants analysed in this work have strong enrichment in nitrogen ([N/Fe] - +0.95) accompanied by lower carbon abundances ([C/Fe] -0.2). Overall, the light- (C, N), α- (O, Mg, Si, Ca, Ti), Fe-peak (Fe, Ni), Odd-Z (Al, K), and the s-process (Ce, Nd, Yb) elemental abundances of our member candidates are consistent with those observed in globular clusters at similar metallicity. Furthermore, the overall star-to-star abundance scatter of elements exhibiting the multiple-population phenomenon in UKS 1 is typical of that found in other global clusters (GCs), and larger than the typical errors of some [X/Fe] abundances. Results from statistical isochrone fits in the VVV colour-magnitude diagrams indicate an age of 13.10-1.29+0.93 Gyr, suggesting that UKS 1 is a fossil relic in the Galactic bulge.es
dc.identifier.citationAstronomy and Astrophysics Volume 643 1 November 2020 Article number A145es
dc.identifier.doi10.1051/0004-6361/202039328en
dc.identifier.issn0004-6361
dc.identifier.urihttps://repositorio.unab.cl/xmlui/handle/ria/53902
dc.language.isoenes
dc.publisherEDP Scienceses
dc.rights.licenseCC BY 4.0 DEED Attribution 4.0 Internationalen
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/deed.enen
dc.subjectGalaxies: clusters: individual: UKS 1es
dc.subjectStars: abundanceses
dc.subjectStars: chemically peculiares
dc.subjectTechniques: spectroscopices
dc.titleThe enigmatic globular cluster UKS 1 obscured by the bulge: H -band discovery of nitrogen-enhanced starses
dc.typeArtículoes
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