Discovery of a new stellar subpopulation residing in the (Inner) stellar halo of the milky way

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dc.contributor.authorFernández-Trincado, José G.
dc.contributor.authorBeers, Timothy C.
dc.contributor.authorPlacco, Vinicius M.
dc.contributor.authorMoreno, Edmundo
dc.contributor.authorAlves-Brito, Alan
dc.contributor.authorMinniti, Dante
dc.contributor.authorTang, Baitian
dc.contributor.authorPérez-Villegas, Angeles
dc.contributor.authorReylé, Céline
dc.contributor.authorRobin, Annie C.
dc.contributor.authorVillanova, Sandro
dc.date.accessioned2023-04-26T21:55:42Z
dc.date.available2023-04-26T21:55:42Z
dc.date.issued2019-11
dc.descriptionIndexación: Scopus.es
dc.description.abstractWe report the discovery of a unique collection of metal-poor giant stars that exhibit anomalously high levels of 28Si, clearly above typical Galactic levels. Our sample spans a narrow range of metallicities, peaking at −1.07 ± 0.06, and exhibits abundance ratios of [Si, Al/Fe] that are as extreme as those observed in Galactic globular clusters (GCs), and Mg is slightly less overabundant. In almost all the sources we used, the elemental abundances were redetermined from high-resolution spectra, which were reanalyzed assuming LTE. Thus, we compiled the main element families, namely, the light elements (C, N), α-elements (O, Mg, Si), iron-peak element (Fe), s-process elements (Ce, Nd), and the light odd-Z element (Al). We also provide dynamical evidence that most of these stars lie on tight (inner) halo-like and retrograde orbits passing through the bulge. Such kinds of objects have been found in present-day halo GCs, providing the clearest chemical signature of past accretion events in the (inner) stellar halo of the galaxy, possibly formed as the result of dissolved halo GCs. Their chemical composition is, in general, similar to that of typical GC populations, although several differences exist.es
dc.description.urihttps://iopscience-iop-org.recursosbiblioteca.unab.cl/article/10.3847/2041-8213/ab5286
dc.identifier.citationAstrophysical Journal Letters Volume 886, Issue 120 November 2019 Article number L8es
dc.identifier.doiDOI: 10.3847/2041-8213/ab5286
dc.identifier.issn2041-8205
dc.identifier.urihttps://repositorio.unab.cl/xmlui/handle/ria/49014
dc.language.isoenes
dc.publisherInstitute of Physics Publishinges
dc.rights.licenseAtribution 4.0 International (CC BY 4.0)
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/deed.es
dc.subjectChemically Peculiar Stars (226)es
dc.subjectStellar Dynamics (1596)es
dc.subjectGalaxy Stellar Content (1608)es
dc.subjectGalaxy Stellar Halos (598)es
dc.subjectSilicon Stars (1459)es
dc.subjectHigh Resolution Spectroscopy (2096)es
dc.subjectStellar Abundanceses
dc.subjectStellar Kinematics (1608)es
dc.titleDiscovery of a new stellar subpopulation residing in the (Inner) stellar halo of the milky wayes
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