Heavy elements Ba, La, Ce, Nd, and Eu in 56 Galactic bulge red giants

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dc.contributor.authorVan der Swaelmen, M
dc.contributor.authorBarbuy, B
dc.contributor.authorHill, V
dc.contributor.authorZoccali, M
dc.contributor.authorMinniti, D
dc.contributor.authorOrtolani, S
dc.contributor.authorGomez, A
dc.date.accessioned2017-08-17T14:07:32Z
dc.date.available2017-08-17T14:07:32Z
dc.date.issued2016-02
dc.descriptionIndexación: Web of Science; Scopus.es_CL
dc.description.abstractAims. The aim of this work is the study of abundances of the heavy elements Ba, La, Ce, Nd, and Eu in 56 bulge giants (red giant branch and red clump) with metallicities ranging from 1 : 3 dex to 0 : 5 dex. Methods. We obtained high-resolution spectra of our giant stars using the FLAMES-UVES spectrograph on the Very Large Telescope. We inspected four bulge fields along the minor axis. Results. We measure the chemical evolution of heavy elements, as a function of metallicity, in the Galactic bulge. Conclusions. The [Ba; La; Ce; Nd = Fe] vs. [Fe = H] ratios decrease with increasing metallicity, in which aspect they differ from disc stars. In our metal-poor bulge stars, La and Ba are enhanced relative to their thick disc counterpart, while in our metal-rich bulge stars La and Ba are underabundant relative to their disc counterpart. Therefore, this contrast between bulge and discs trends indicates that bulge and (solar neighbourhood) thick disc stars could behave differently. An increase in left perpendicularLa; Nd = Euright perpendicular with increasing metallicity, for metal-rich stars with [Fe = H] > 0 dex, may indicate that the s-process from AGB stars starts to operate at a metallicity around solar. Finally, [Eu = Fe] follows the [alpha = Fe] behaviour, as expected, since these elements are produced by SNe type II.es_CL
dc.description.urihttps://www.aanda.org/articles/aa/abs/2016/02/aa25709-15/aa25709-15.html
dc.identifier.citationAstronomy and Astrophysics Volume 586, 1 February 2016, Article number A1es_CL
dc.identifier.issn1432-0746
dc.identifier.other10.1051/0004-6361/201525709
dc.identifier.urihttp://repositorio.unab.cl/xmlui/handle/ria/3956
dc.language.isoenes_CL
dc.publisherEDP SCIENCESes_CL
dc.subjectStars: abundanceses_CL
dc.subjectStars: atmosphereses_CL
dc.subjectGalaxy: bulgees_CL
dc.titleHeavy elements Ba, La, Ce, Nd, and Eu in 56 Galactic bulge red giantses_CL
dc.typeArtículoes_CL
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