NGC 1866: a milestone for understanding the chemical evolution of stellar populations in the LMC

Abstract

We present new FLAMES@VLT spectroscopic observations of 30 stars in the field of the LMC stellar cluster NGC 1866. NGC 1866 is one of the few young and massive globular cluster that is close enough so that its stars can be individually studied in detail. Radial velocities have been used to separate stars belonging to the cluster and to the LMC field and the same spectra have been used to derive chemical abundances for a variety of elements, from [Fe/H] to the light (i.e. Na, O, Mg...) to the heavy ones. The average iron abundance of NGC 1866 turns out to be [Fe/H]= -0.43+-0.01 dex (with a dispersion of 0.04 dex), from the analysis of 14 cluster-member stars. Within our uncertainties, the cluster stars are homogeneous, as far as chemical composition is concerned, independent of the evolutionary status. The observed cluster stars do not show any sign of the light elements 'anti-correlation' present in all the Galactic globular clusters so far studied, and also found in the old LMC stellar clusters. A similar lack of anti-correlations has been detected in the massive intermediate-age LMC clusters, indicating a different formation/evolution scenario for the LMC massive clusters younger than ~3 Gyr with respect to the old ones. Also opposite to the Galactic globulars, the chemical composition of the older RGB field stars and of the young post-MS cluster stars show robust homogeneity suggesting a quite similar process of chemical evolution. The field and cluster abundances are in agreement with recent chemical analysis of LMC stars, which show a distinctive chemical pattern for this galaxy with respect to the Milky Way. We discuss these findings in light of the theoretical scenario of chemical evolution of the LMC.

Accepted for publication in the MNRAS (16 pages, 13 figures, 6 tables)

References in corpus (10)

• Formation and Dynamical Evolution of Multiple Stellar Generations in Globular Clusters
• Are the Magellanic Clouds on their First Passage about the Milky Way?
• Looking outside the Galaxy: the discovery of chemical anomalies in 3 old Large Magellanic Cloud clusters
• The chemical composition of red giant stars in four intermediate-age clusters of the Large Magellanic Cloud
• Abundances in intermediate-mass AGB stars undergoing third dredge-up and hot-bottom burning
• A comparison of the s- and r-process element evolution in local dwarf spheroidal galaxies and in the Milky Way
• Red Giant stars in the Large Magellanic Cloud clusters
• The solar photospheric abundance of europium. Results from CO5BOLD 3-D hydrodynamical model atmospheres
• AGB nucleosynthesis in the Large Magellanic Cloud. Detailed abundance analysis of the RV Tauri star MACHO47.2496.8
• Detailed Chemical Abundances of Globular Clusters in Local Group Dwarf Galaxies

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