CAPOS: the bulge Cluster APOgee Survey IV elemental abundances of the bulge globular cluster NGC 6558

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dc.contributor.authorGonzález-Díaz, Danilo
dc.contributor.authorFernández-Trincado, José G.
dc.contributor.authorVillanova, Sandro
dc.contributor.authorGeisler, Doug
dc.contributor.authorBarbuy, Beatriz
dc.contributor.authorMinniti, Dante
dc.contributor.authorBeers, Timothy C.
dc.contributor.authorBidin, Christian Moni
dc.contributor.authorMauro, Francesco
dc.contributor.authorMuñoz, Cesar
dc.contributor.authorTang, Baitian
dc.contributor.authorSoto, Mario
dc.contributor.authorMonachesi, Antonela
dc.contributor.authorLane, Richard R.
dc.contributor.authorFrelijj, Heinz
dc.date.accessioned2023-12-05T18:30:36Z
dc.date.available2023-12-05T18:30:36Z
dc.date.issued2023-12-01
dc.descriptionINDEXACIÓN: SCOPUS.es
dc.description.abstractThis study presents the results concerning six red giant stars members of the globular cluster NGC 6558. Our analysis utilized high-resolution near-infrared spectra obtained through the CAPOS initiative (the APOgee Survey of Clusters in the Galactic Bulge), which focuses on surveying clusters within the Galactic Bulge, as a component of the Apache Point Observatory Galactic Evolution Experiment II survey (APOGEE-2). We employ the Brussels Automatic Code for Characterizing High accUracy Spectra (BACCHUS) code to provide line-by-line elemental-abundances for Fe-peak (Fe, Ni), α-(O, Mg, Si, Ca, Ti), light-(C, N), odd-Z (Al), and the s-process element (Ce) for the four stars with high-signal-to-noise ratios. This is the first reliable measure of the CNO abundances for NGC 6558. Our analysis yields a mean metallicity for NGC 6558 of 〈[Fe/H]〉 = −1.15 ± 0.08, with no evidence for a metallicity spread. We find a Solar Ni abundance, 〈[Ni/Fe]〉 ∼ +0.01, and a moderate enhancement of α-elements, ranging between +0.16 and [removed] +0.99, along with a low level of carbon, [C/Fe] < −0.12. This behaviour of Nitrogen-Carbon is a typical chemical signature for the presence of multiple stellar populations in virtually all GCs; this is the first time that it is reported in NGC 6558. We also observed a remarkable consistency in the behaviour of all the chemical species compared to the other CAPOS bulge GCs of the same metallicity. © The Author(s) 2023.es
dc.identifier.citationMonthly Notices of the Royal Astronomical Society, Volume 526, Issue 4, Pages 6274 - 6283, 1 December 2023es
dc.identifier.doi10.1093/mnras/stad3178
dc.identifier.issn00358711
dc.identifier.urihttps://repositorio.unab.cl/xmlui/handle/ria/54412
dc.language.isoenes
dc.publisherOxford University Presses
dc.rights.licenseCC BY 4.0 DEED Attribution 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectgalaxy: globular clusters: individual: NGC 6558es
dc.subjectstars: abundanceses
dc.subjectstars: chemically peculiares
dc.subjectTechniques: spectroscopices
dc.titleCAPOS: the bulge Cluster APOgee Survey IV elemental abundances of the bulge globular cluster NGC 6558es
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