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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/28438

Title: NGC 1866: a milestone for understanding the chemical evolution of stellar populations in the Large Magellanic Cloud
Authors: Mucciarelli, A.
Cristallo, S.
Brocato, E.
Paquini, L.
Straniero, O.
Caffau, E.
Raimondo, G.
Kaufer, A.
Musella, I.
Ripepi, V.
Romaniello, M.
Walker, A. R.
Issue Date: 2010
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.
Sponsorship: Part of this work has been supported by the Spanish Ministry of Science and Innovation projects AYA2008-04211-C02-02.
Publisher: Oxford University Press (OUP); Royal Astronomical Society
Keywords: Stars
Abundances
Galaxies
Large Magellanic Clouds (LMC)
Techniques
Spectroscopic
Globular clusters
NGC 1866
URI: http://hdl.handle.net/10481/28438
ISSN: 0035-8711
1365-2966
Rights : Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Citation: Mucciarelli, A.; et al. NGC 1866: a milestone for understanding the chemical evolution of stellar populations in the Large Magellanic Cloud. Monthly Notices fo the Royal Astronomical Society, 413(2): 837-851 (2011). [http://hdl.handle.net/10481/28438]
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