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dc.contributor.author
Fernández Trincado, José G.
dc.contributor.author
Minniti, Dante
dc.contributor.author
Beers, Timothy C.
dc.contributor.author
Sandro, Villanova
dc.contributor.author
Geisler, Doug
dc.contributor.author
Souza, Stefano O.
dc.contributor.author
Smith, Leigh C.
dc.contributor.author
Placco, Vinicius M.
dc.contributor.author
Vieira, Katherine
dc.contributor.author
Pérez Villegas, Angeles
dc.contributor.author
Barbuy, Beatriz
dc.contributor.author
Alves Brito, Alan
dc.contributor.author
Bidin, Christian Moni
dc.contributor.author
Alonso García, Javier
dc.contributor.author
Tang, Baitian
dc.contributor.author
Palma, Tali
dc.date.available
2021-10-27T18:23:26Z
dc.date.issued
2020-11
dc.identifier.citation
Fernández Trincado, José G.; Minniti, Dante; Beers, Timothy C.; Sandro, Villanova; Geisler, Doug; et al.; The enigmatic globular cluster UKS 1 obscured by the bulge: H -band discovery of nitrogen-enhanced stars; EDP Sciences; Astronomy and Astrophysics; 643; 11-2020; 1-16
dc.identifier.issn
0004-6361
dc.identifier.uri
http://hdl.handle.net/11336/145254
dc.description.abstract
The 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 (µα cos(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+0.93 −1.29 Gyr, suggesting that UKS 1 is a fossil relic in the Galactic bulge.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
EDP Sciences
dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
GALAXIES: CLUSTERS: INDIVIDUAL: UKS 1
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STARS: ABUNDANCES
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STARS: CHEMICALLY PECULIAR
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TECHNIQUES: SPECTROSCOPIC
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Astronomía
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Ciencias Físicas
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CIENCIAS NATURALES Y EXACTAS
dc.title
The enigmatic globular cluster UKS 1 obscured by the bulge: H -band discovery of nitrogen-enhanced stars
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2021-10-18T15:45:04Z
dc.identifier.eissn
1432-0746
dc.journal.volume
643
dc.journal.pagination
1-16
dc.journal.pais
Francia
dc.journal.ciudad
Paris
dc.description.fil
Fil: Fernández Trincado, José G.. Universidad de Atacama.; Chile. Universite de Bourgogne; Francia. Centre National de la Recherche Scientifique; Francia
dc.description.fil
Fil: Minniti, Dante. Universidad Andrés Bello; Chile. Vatican Observatory; Italia
dc.description.fil
Fil: Beers, Timothy C.. University of Notre Dame; Estados Unidos
dc.description.fil
Fil: Sandro, Villanova. Universidad de Concepción; Chile
dc.description.fil
Fil: Geisler, Doug. Universidad de Concepción; Chile. Universidad de La Serena; Chile
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Fil: Souza, Stefano O.. Universidade de Sao Paulo; Brasil
dc.description.fil
Fil: Smith, Leigh C.. University of Cambridge; Reino Unido
dc.description.fil
Fil: Placco, Vinicius M.. National Optical-Infrared Astronomy Research Laboratory; Estados Unidos
dc.description.fil
Fil: Vieira, Katherine. Universidad de Atacama; Chile
dc.description.fil
Fil: Pérez Villegas, Angeles. Universidade de Sao Paulo; Brasil
dc.description.fil
Fil: Barbuy, Beatriz. Universidade de Sao Paulo; Brasil
dc.description.fil
Fil: Alves Brito, Alan. Universidade Federal do Rio Grande do Sul; Brasil
dc.description.fil
Fil: Bidin, Christian Moni. Universidad Católica del Norte; Chile
dc.description.fil
Fil: Alonso García, Javier. Universidad de Antofagasta; Chile. Millennium Institute of Astrophysics; Chile
dc.description.fil
Fil: Tang, Baitian. Sun Yat-sen University; China
dc.description.fil
Fil: Palma, Tali. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Astronomía Teórica y Experimental. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Instituto de Astronomía Teórica y Experimental; Argentina
dc.journal.title
Astronomy and Astrophysics
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://www.aanda.org/articles/aa/abs/2020/11/aa39328-20/aa39328-20.html
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1051/0004-6361/202039328
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