The First Deep Chemical Study of NGC 2298

We present the first detailed elemental abundances of stars in the metal-poor globular cluster NGC 2298. Based on near-infrared high- resolution (R ∼ 22,500) spectra of 12 members obtained during the second phase of the Apache Point Observatory Galactic Evolution Experiment (APOGEE) at Las Campanas Observatory as part of the seventeenth Data Release (DR 17) of the Sloan Digital Sky Survey IV. We employed the Brussels Automatic Code for Characterizing High accuracy Spectra (BACCHUS).

We find a mean and median metallicity [Fe/H]= -1.76 and -1.75, respectively, with a star-to-star spread of 0.14 dex, which is compatible with the internal measurement errors. we don’t find any evidence for an intrinsic [Fe/H] abundance spread. The typical α-element enrichment in NGC 2298 is overabundant relative to the Sun, and it follows the trend of other metal-poor GCs. We confirm the existence of an Al-enhanced population in this cluster, which is clearly anti-correlated with Mg, indicating the prevalence of the multiple-population phenomenon in NGC 2298.