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

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dc.contributor.authorGonzález-Díaz, D.
dc.contributor.authorFernández-Trincado, J. G.
dc.contributor.authorVillanova, S.
dc.contributor.authorGeisler, D.
dc.contributor.authorBarbuy, B.
dc.contributor.authorMinniti, D.
dc.contributor.authorBeers, T. C.
dc.contributor.authorBidin, C. M.
dc.contributor.authorMauro, F.
dc.contributor.authorMuñoz, C.
dc.contributor.authorTang, B. T.
dc.contributor.authorSoto, M.
dc.contributor.authorMonachesi, A.
dc.contributor.authorLane, R. R.
dc.contributor.authorFrelijj, H.
dc.date.accessioned2024-05-27T00:26:00Z
dc.date.available2024-05-27T00:26:00Z
dc.date.issued2023-10-20
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 Surv e y of Clusters in the Galactic Bulge), which focuses on surv e ying clusters within the Galactic Bulge, as a component of the Apache Point Observatory Galactic Evolution Experiment II surv e y (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), alpha-(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]) similar to + 0.01, and a moderate enhancement of alpha-elements, ranging between + 0.16 and < + 0.42, and a slight enhancement of the s-process element ([Ce/Fe]) similar to + 0.19. We also found low levels of ([Al/Fe]) similar to + 0.09, but with a strong enrichment of nitrogen, [N/Fe] > + 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.
dc.identifier.citationGonzález-Díaz, D., Fernández-Trincado, J. G., Villanova, S., Geisler, D., Barbuy, B., Minniti, D., . . . Frelijj, H. (2023). CAPOS: the bulge Cluster APOgee Survey IV elemental abundances of the bulge globular cluster NGC 6558. Monthly Notices of the Royal Astronomical Society, 526(4), 6274-6283. https://doi.org/10.1093/mnras/stad3178
dc.identifier.issn0035-8711
dc.identifier.other1365-2966
dc.identifier.urihttps://conocimientoabierto.online/handle/123456789/67
dc.language.isoen
dc.publisherMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
dc.subjectTechniques: spectroscopic
dc.subjectstars: abundances
dc.subjectstars: chemically peculiar
dc.subjectgalaxy: globular clusters: individual: NGC 6558
dc.subjectFINAL TARGETING STRATEGY
dc.subjectROTATING MASSIVE STARS
dc.subjectDIGITAL SKY SURVEY
dc.subjectMETAL-POOR STARS
dc.subjectDATA RELEASES 13
dc.subjectMILKY-WAY BULGE
dc.subjectN-RICH STARS
dc.subjectR-PROCESS
dc.subjectS-PROCESS
dc.subjectCHEMICAL ABUNDANCES
dc.titleCAPOS: the bulge Cluster APOgee Survey IV elemental abundances of the bulge globular cluster NGC 6558
dc.typeArticle

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