APOGEE-2S Mg-Al anti-correlation of the Metal-Poor Globular Cluster NGC 2298
| Autor: | Baeza, Ian, Fernández-Trincado, José G., Villanova, Sandro, Geisler, Doug, Minniti, Dante, Garro, Elisa R., Barbuy, Beatriz, Beers, Timothy C., Lane, Richard R. |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | A&A 662, A47 (2022) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1051/0004-6361/202243475 |
| Popis: | We present detailed elemental abundances and radial velocities of stars in the metal-poor globular cluster (GC) NGC 2298, based on near-infrared high-resolution ($R\sim$ 22,500) spectra of twelve members obtained during the second phase of the Apache Point Observatory Galactic Evolution Experiment (APOGEE-2) at Las Campanas Observatory as part of the seventeenth Data Release (DR 17) of the Sloan Digital Sky Survey IV (SDSS-IV). We employ the Brussels Automatic Code for Characterizing High accuracy Spectra (\texttt{BACCHUS}) software to investigate abundances for a variety of species including $\alpha$-elements (Mg, Si, and Ca), the odd-Z element Al, and iron-peak elements (Fe and Ni) located in the innermost regions of NGC 2298. 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, compatible with the internal measurement errors. Thus, we find no evidence for an intrinsic Fe abundance spread in NGC 2298. The typical $\alpha-$element enrichment in NGC 2298 is overabundant relative to the Sun, and 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. Comment: Accepted to Astronomy & Astrophysics. 9 pages, 5 figures, 1 table |
| Databáze: | arXiv |
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