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

Vista sencilla de ítem
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.accessioned2017-07-21T22:17:23Z
dc.date.available2017-07-21T22:17:23Z
dc.date.issued2015-07
dc.descriptionIndexación: Web of Science; Scopus.es_CL
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. Aims. 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. Results. 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. Conclusions. 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.es_CL
dc.description.urihttps://www.aanda.org/articles/aa/abs/2015/07/aa25509-14/aa25509-14.html
dc.identifier.citationAstronomy and Astrophysics Volume 579, 1 July 2015, Article number 201425509es_CL
dc.identifier.issn0004-6361
dc.identifier.otherhttps://doi.org/10.1051/0004-6361/201425509
dc.identifier.urihttp://repositorio.unab.cl/xmlui/handle/ria/3763
dc.language.isoenes_CL
dc.publisherEDP SCIENCESes_CL
dc.subjectGalaxy: abundanceses_CL
dc.subjectGlobular clusters: individual: NGC 5053es_CL
dc.subjectGlobular clusters: individual: NGC 5634es_CL
dc.subjectGalaxies: activees_CL
dc.subjectStars: abundanceses_CL
dc.subjectGalaxies: individual: Sgr dSphes_CL
dc.titleChemical abundances of giant stars in NGC 5053 and NGC 5634, two globular clusters associated with the Sagittarius dwarf spheroidal galaxy?es_CL
dc.typeArtículoes_CL
Archivos
Bloque original
Mostrando 1 - 1 de 1
Miniatura
Nombre:
Sbordone_L_Chemical_abundances_of_giant_stars.pdf
Tamaño:
2.01 MB
Formato:
Adobe Portable Document Format
Descripción:
TEXTO COMPLETO INGLES
Descargar
Bloque de licencias
Mostrando 1 - 1 de 1
No hay miniatura disponible
Nombre:
license.txt
Tamaño:
1.71 KB
Formato:
Item-specific license agreed upon to submission
Descripción:
Descargar
Colecciones
FCE - Artículos de Revista