The intermediate-age globular cluster NGC 1783 in the Large Magellanic Cloud

Abstract

We present Hubble Space Telescope ACS deep photometry of the intermediate-age globular cluster NGC 1783 in the Large Magellanic Cloud. By using this photometric dataset, we have determined the degree of ellipticity of the cluster ($\epsilon$=0.14$\pm$0.03) and the radial density profile. This profile is well reproduced by a standard King model with an extended core (r_c=24.5'') and a low concentration (c=1.16), indicating that the cluster has not experienced the collapse of the core. We also derived the cluster age, by using the Pisa Evolutionary Library (PEL) isochrones, with three different amount of overshooting (namely, ${\Lambda }_{os}$=0.0, 0.10 and 0.25). From the comparison of the observed Color-Magnitude Diagram (CMD) and Main Sequence (MS) Luminosity Function (LF) with the theoretical isochrones and LFs, we find that only models with the inclusion of some overshooting (${\Lambda }_{os}$=0.10-0.25) are able to reproduce the observables. By using the magnitude difference $\delta V_{SGB}^{He-Cl}=0.90$ between the mean level of the He-clump and the flat region of the SGB, we derive an age $\tau$=1.4$\pm$0.2 Gyr.

Accepted to publication by AJ

References in corpus (25)

• Internal Dynamics of Globular Clusters
• Surface Brightness Profiles and Structural Parameters for 53 Rich Stellar Clusters in the Large Magellanic Cloud
• A double main sequence turn-off in the rich star cluster NGC 1846 in the Large Magellanic Cloud
• Transforming observational data and theoretical isochrones into the ACS/WFC Vega-mag system
• A Search for Old Star Clusters in the Large Magellanic Cloud
• Dynamics and Interactions of Binaries and Neutron Stars in Globular Clusters
• A Review of the Distance and Structure of the Large Magellanic Cloud
• Discovery of another peculiar radial distribution of Blue Stragglers in Globular Clusters: The case of 47 Tuc
• Testing intermediate-age stellar evolution models with VLT photometry of LMC clusters. III. Padova results
• Physical parameters of 15 intermediate-age LMC clusters from modelling of HST colour-magnitude diagrams
• Photometry of Magellanic Cloud clusters with the Advanced Camera for Surveys - I. The old LMC clusters NGC 1928, 1939 and Reticulum
• Globular Clusters in the Magellanic Clouds.II: IR-Array Photometry for 12 Globulars and Contributions to the Integrated Cluster Light
• Transformations between the theoretical and observational planes in the HST-NICMOS and WFPC2 photometric systems
• HST Colour-Magnitude Diagrams of Six Old Globular Clusters in the LMC
• Testing intermediate-age stellar evolution models with VLT photometry of LMC clusters. I. The data
• The globular cluster NGC 1978 in the Large Magellanic Cloud
• NGC 1866: a workbench for stellar evolution
• The Large Magellanic Cloud globular cluster NGC 1866: new data, new models, new analysis
• The luminosity function of the Large Magellanic Cloud globular cluster NGC 1866
• Photometry of Magellanic Cloud clusters with the Advanced Camera for Surveys - II. The unique LMC cluster ESO 121-SC03
• Red Giant stars in the Large Magellanic Cloud clusters
• On the Iron content of NGC 1978 in the LMC: a metal rich, chemically homogeneous cluster
• Probing the RGB-phase transition: Near-IR photometry of six intermediate age LMC clusters
• Three clusters of the SMC from ACS/WFC HST archive data: NGC 265, K~29 and NGC 290 and their fields
• The age of old Magelanic Cloud clusters. I: NGC 2257.

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• Expanding the time domain of multiple populations: evidences of nitrogen variations in the ~1.5 Gyr old star cluster NGC 1783
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• A New Approach to Convective Core Overshooting: Probabilistic Constraints from Color-Magnitude Diagrams of LMC Clusters
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• On the Nitrogen variation in ~2 Gyr old massive star clusters in the Large Magellanic Cloud
• SNe and their impact during the early evolution of Type I Globular Clusters
• Blue straggler stars beyond the Milky Way. II. A binary origin for blue straggler stars in Magellanic Cloud clusters
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