The Gaia-ESO Survey: Detailed abundances in the metal-poor globular cluster NGC 4372

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title = "The Gaia-ESO Survey: Detailed abundances in the metal-poor globular cluster NGC 4372",
abstract = "We present the abundance analysis for a sample of 7 red giant branch stars in the metal-poor globular cluster NGC 4372 based on UVES spectra acquired as part of the Gaia-ESO Survey. This is the first extensive study of this cluster from high-resolution spectroscopy. We derive abundances of O, Na, Mg, Al, Si, Ca, Sc, Ti, Fe, Cr, Ni, Y, Ba, and La. We find a metallicity of [Fe/H] = -2.19 +/- 0.03 and find no evidence of any metallicity spread. This metallicity makes NGC 4372 one of the most metal-poor Galactic globular clusters. We also find an a-enhancement typical of halo globular clusters at this metallicity. Significant spreads are observed in the abundances of light elements. In particular, we find a Na-O anticorrelation. Abundances of O are relatively high compared with other globular clusters. This could indicate that NGC 4372 was formed in an environment with high O for its metallicity. A Mg-Al spread is also present that spans a range of more than 0.5 dex in Al abundances. Na is correlated with Al and Mg abundances at a lower significance level. This pattern suggests that the Mg-Al burning cycle is active. This behavior can also be seen in giant stars of other massive, metal-poor clusters. A relation between light and heavy s-process elements has been identified.",
keywords = "globular clusters: individual: NGC 4372, stars: abundances",
author = "{San Roman}, I. and C. Munoz and D. Geisler and S. Villanova and N. Kacharov and A. Koch and G. Carraro and G. Tautvaisiene and A. Vallenari and Alfaro, {E. J.} and Thomas Bensby and E. Flaccomio and P. Francois and Korn, {A. J.} and E. Pancino and A. Recio-Blanco and R. Smiljanic and M. Bergemann and Costado, {M. T.} and F. Damiani and U. Heiter and A. Hourihane and P. Jofre and C. Lardo and {de Laverny}, P. and T. Masseron and L. Morbidelli and L. Sbordone and Sousa, {S. G.} and Worley, {C. C.} and S. Zaggia",
year = "2015",
doi = "10.1051/0004-6361/201525722",
language = "English",
volume = "579",
journal = "Astronomy & Astrophysics",
issn = "1432-0746",
publisher = "EDP Sciences",