A spectroscopic study of the globular Cluster NGC 4147

dc.contributor.authorVillanova, S.
dc.contributor.authorMonaco, L.
dc.contributor.authorMoni Bidin, C.
dc.contributor.authorAssmann, P.
dc.date.accessioned2017-02-09T15:16:39Z
dc.date.available2017-02-09T15:16:39Z
dc.date.issued2016-08
dc.descriptionIndexación: Web of Sciencees
dc.description.abstractWe present the abundance analysis for a sample of 18 red giant branch stars in the metal-poor globular cluster NGC 4147 based on medium- and high-resolution spectra. This is the first extensive spectroscopic study of this cluster. We derive abundances of C, N, O, Na, Mg, Al, Si, Ca, Ti, Cr, Fe, Ni, Y, Ba, and Eu. We find a metallicity of [Fe/H] = -1.84 +/- 0.02 and an alpha-enhancement of +0.38 +/- 0.05 (errors on the mean), typical of halo globular clusters in this metallicity regime. A significant spread is observed in the abundances of light elements C, N, O, Na, and Al. In particular, we found an Na-O anticorrelation and Na-Al correlation. The cluster contains only similar to 15 per cent of stars that belong to the first generation (Na-poor and O-rich). This implies that it suffered a severe mass-loss during its lifetime. Its [Ca/Fe] and [Ti/Fe] mean values agree better with the Galactic halo trend than with the trend of extragalactic environments at the cluster metallicity. This possibly suggests that NGC 4147 is a genuine Galactic object at odd with what claimed by some author that proposed the cluster to be member of the Sagittarius dwarf galaxy. An antirelation between the light s-process element Y and Na may also be present.es
dc.description.urihttps://academic.oup.com/mnras/article-lookup/doi/10.1093/mnras/stw1146
dc.identifier.citationMon Not R Astron Soc (2016) 460 (3): 2351-2359.es
dc.identifier.issn0035-8711
dc.identifier.otherhttps://doi.org/10.1093/mnras/stw1146
dc.identifier.urihttp://repositorio.unab.cl/xmlui/handle/ria/2972
dc.language.isoenes
dc.publisherOXFORD UNIV PRESSes
dc.subjectStars: abundanceses
dc.subjectGlobular clusters: individual: NGC4147es
dc.titleA spectroscopic study of the globular Cluster NGC 4147es
dc.typeArtículoes
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