Probing the Large Magellanic Cloud's recent chemical enrichment history through its star clusters

Abstract

We present Washington system colour-magnitude diagrams (CMDs) for 17 practically unstudied star clusters located in the bar as well as in the inner disc and outer regions of the Large Magellanic Cloud (LMC). Cluster sizes were estimated from star counts distributed throughout the entire observed fields. Based on the best fits of theoretical isochrones to the cleaned $(C-T_1,T_1)$ CMDs, as well as on the $\delta T_1$ parameter and the standard giant branch method, we derive ages and metallicities for the cluster sample. Four objects are found to be intermediate-age clusters (1.8-2.5 Gyr), with [Fe/H] ranging from -0.66 to -0.84. With the exception of SL263, a very young cluster ($\sim$ 16 Myr), the remaining 12 objects are aged between 0.32 and 0.89 Gyr, with their [Fe/H] values ranging from -0.19 to -0.50. We combined our results with those for other 231 clusters studied in a similar way using the Washington system. The resulting age-metallicity relationship shows a significant dispersion in metallicities, whatever age is considered. Although there is a clear tendency for the younger clusters to be more metal-rich than the intermediate ones, we believe that none of the chemical evolution models currently available in the literature reasonably well represents the recent chemical enrichment processes in the LMC clusters. The present sample of 17 clusters is part of our ongoing project of generating a database of LMC clusters homogeneously studied using the Washington photometric system and applying the same analysis procedure

arXiv comment11 pages, 20 figures, 3 tables, Accepted for publication in MNRAS

References in corpus (18)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• PARSEC: stellar tracks and isochrones with the PAdova and TRieste Stellar Evolution Code
• Theoretical isochrones in several photometric systems I. Johnson-Cousins-Glass, HST/WFPC2, HST/NICMOS, Washington, and ESO Imaging Survey filter sets
• Database of Geneva stellar evolution tracks and isochrones for UBVRIJHKLL'M, HST-WFPC2, Geneva and Washington photometric systems
• The Star Formation History of the Large Magellanic Cloud
• Chemical Evolution of the Magellanic Clouds: analytical models
• A general catalogue of extended objects in the Magellanic System
• A Search for Old Star Clusters in the Large Magellanic Cloud
• A revised and extended catalog of Magellanic System clusters, associations and emission nebulae. II. the LMC
• The star cluster formation history of the LMC
• The VMC Survey IV. The LMC star formation history and disk geometry from four VMC tiles
• Ages and Metallicities of Star Clusters and Surrounding Fields in the Outer Disk of the Large Magellanic Cloud
• First Results from the NOAO Survey of the Outer Limits of the Magellanic Clouds
• Washington photometry of candidate star clusters in the Small Magellanic Cloud
• Standard Giant Branches in the Washington Photometric System
• The Mysterious bar of the Large Magellanic Cloud: What is it?
• The Optical Gravitational Lensing Experiment. Catalog of Star Clusters from the Large Magellanic Cloud
• A sample of relatively unstudied star clusters in the Large Magellanic Cloud: fundamental parameters determined from Washington photometry

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