González-Díaz, D.Fernández-Trincado, J. G.Villanova, S.Geisler, D.Barbuy, B.Minniti, D.Beers, T. C.Bidin, C. M.Mauro, F.Muñoz, C.Tang, B. T.Soto, M.Monachesi, A.Lane, R. R.Frelijj, H.2024-05-272024-05-272023-10-20González-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/stad31780035-87111365-2966https://conocimientoabierto.online/handle/123456789/67This 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.enTechniques: spectroscopicstars: abundancesstars: chemically peculiargalaxy: globular clusters: individual: NGC 6558FINAL TARGETING STRATEGYROTATING MASSIVE STARSDIGITAL SKY SURVEYMETAL-POOR STARSDATA RELEASES 13MILKY-WAY BULGEN-RICH STARSR-PROCESSS-PROCESSCHEMICAL ABUNDANCESArticle