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In this article, we present a detailed chemical analysis of seven red giantmembers of NGC 6553 using high-resolution spectroscopy from VLT FLAMES. Weobtained the stellar parameters (Teff, Log(g), vt, [Fe/H]) of these stars fromthe spectra, and we measured the chemical abundance for 20 elements, includinglight elements, iron-peak elements, alpha-elements and neutron-captureelements. The metallicities in our sample stars are consistent with ahomogeneous distribution. We found a mean of [Fe/H]=-0.14+/-0.07 dex, inagreement with other studies. Using the alpha-elements Mg, Si, Ca and Ti weobtain the mean of [alpha/Fe]=0.11+/-0.05. We found a vertical relation betweenNa and O, characterized by a significant spread in Na and an almostnon-existent spread in O. In fact, Na and Al are the only two light elementswith a large intrinsic spread, which demonstrates the presence of MultiplePopulations (MPs). An intrinsic spread in Mg is not detected in this study. Thealpha, iron-peak and neutron capture elements show good agreement with thetrend of the bulge field stars, indicating similar origin and evolution, inconcordance with our previous studies for two other bulge GCs (NGC 6440 and NGC6528).

The vertical Na-O relation in the bulge globular cluster NGC 6553