Chemical abundances of giant stars in NGC 5053 and NGC 5634, two globular clusters associated with the Sagittarius dwarf spheroidal galaxy?

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dc.contributor.authorSbordone, L.
dc.contributor.authorMonaco, L.
dc.contributor.authorMoni Bidin, C.
dc.contributor.authorBonifacio, P.
dc.contributor.authorVillanova, S.
dc.contributor.authorBellazzini, M.
dc.contributor.authorIbata, R.
dc.contributor.authorChiba, M.
dc.contributor.authorGeisler, D.
dc.contributor.authorCaffau, E.
dc.contributor.authorDuffau, S.
dc.date.accessioned2024-01-10T12:37:58Z
dc.date.available2024-01-10T12:37:58Z
dc.date.issued2015
dc.description.abstractContext. The tidal disruption of the Sagittarius dwarf spheroidal galaxy (Sgr dSph) is producing the most prominent substructure in the Milky Way (MW) halo, the Sagittarius Stream. Aside from field stars, it is suspected that the Sgr dSph has lost a number of globular clusters (GC). Many Galactic GC are thought to have originated in the Sgr dSph. While for some candidates an origin in the Sgr dSph has been confirmed owing to chemical similarities, others exist whose chemical composition has never been investigated.
dc.description.abstractAims. NGC 5053 and NGC 5634 are two of these scarcely studied Sgr dSph candidate-member clusters. To characterize their composition we analyzed one giant star in NGC 5053, and two in NGC 5634. Methods. We analyze high-resolution and signal-to-noise spectra by means of the MyGIsFOS code, determining atmospheric parameters and abundances for up to 21 species between O and Eu. The abundances are compared with those of MW halo field stars, of unassociated MW halo globulars, and of the metal-poor Sgr dSph main body population.
dc.description.abstractResults. We derive a metallicity of [Fe II/H] = 2.26 +/- 0.10 for NGC 5053, and of [Fe I/H] = 1.99 +/- 0.075 and 1.97 +/- 0.076 for the two stars in NGC 5634. This makes NGC 5053 one of the most metal-poor globular clusters in the MW. Both clusters display an alpha enhancement similar to the one of the halo at comparable metallicity. The two stars in NGC 5634 clearly display the Na-O anticorrelation widespread among MW globulars. Most other abundances are in good agreement with standard MW halo trends.
dc.description.abstractConclusions. The chemistry of the Sgr dSph main body populations is similar to that of the halo at low metallicity. It is thus difficult to discriminate between an origin of NGC 5053 and NGC 5634 in the Sgr dSph, and one in the MW. However, the abundances of these clusters do appear closer to that of Sgr dSph than of the halo, favoring an origin in the Sgr dSph system.
dc.description.funderChile's Ministry of Economy, Development, and Tourism's Millennium Science Initiative
dc.description.funderFondecyt
dc.description.funderPRIN MIUR
dc.description.funderChilean BASAL Centro de Excelencia en Astrofisica y Tecnologias Afines (CATA)
dc.description.funderFONDATION MERAC
dc.fechaingreso.objetodigital2024-05-02
dc.format.extent12 páginas
dc.fuente.origenWOS
dc.identifier.doi10.1051/0004-6361/201425509
dc.identifier.eissn1432-0746
dc.identifier.issn0004-6361
dc.identifier.urihttps://doi.org/10.1051/0004-6361/201425509
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/76961
dc.identifier.wosidWOS:000358877100116
dc.information.autorucAstrofísica;Duffau S;S/I;238151
dc.information.autorucAstrofísica;Sbordone L;S/I;243032
dc.language.isoen
dc.nota.accesocontenido parcial
dc.publisherEDP SCIENCES S A
dc.revistaASTRONOMY & ASTROPHYSICS
dc.rightsacceso restringido
dc.subjectGalaxy: abundances
dc.subjectglobular clusters: individual: NGC 5053
dc.subjectglobular clusters: individual: NGC 5634
dc.subjectgalaxies: active
dc.subjectstars: abundances
dc.subjectgalaxies: individual: Sgr dSph
dc.subjectMETAL-POOR STARS
dc.subjectMILKY-WAY SATELLITES
dc.subjectDARK-MATTER
dc.subjectRADIAL-VELOCITIES
dc.subjectNLTE ABUNDANCES
dc.subjectLARGE-SAMPLE
dc.subjectTURN-OFF
dc.subjectHALO
dc.subjectELEMENTS
dc.subjectKINEMATICS
dc.subject.ods11 Sustainable Cities and Communities
dc.subject.odspa11 Ciudades y comunidades sostenibles
dc.titleChemical abundances of giant stars in NGC 5053 and NGC 5634, two globular clusters associated with the Sagittarius dwarf spheroidal galaxy?
dc.typeartículo
dc.volumen579
sipa.codpersvinculados238151
sipa.codpersvinculados243032
sipa.indexWOS
sipa.indexScopus
sipa.trazabilidadCarga SIPA;09-01-2024
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