Testing intermediate-age stellar evolution models with VLT photometry of LMC clusters. I. The data

Abstract

This is the first of a series of three papers devoted to the calibration of a few parameters of crucial importance in the modeling of the evolution of intermediate-mass stars, with special attention to the amount of convective core overshoot. To this end we acquired deep V and R photometry for three globular clusters of the Large Magellanic Cloud (LMC), namely NGC 2173, SL 556 and NGC 2155, in the age interval 1-3 Gyr. In this first paper, we describe the aim of the project, the VLT observations and data reduction, and we make preliminary comparisons of the color-magnitude diagrams with both Padova and Yonsei-Yale isochrones. Two following papers in this series present the results of a detailed analysis of these data, independently carried out by members of the Yale and Padova stellar evolution groups. This allows us to compare both sets of models and discuss their main differences, as well as the systematic effects that they would have to the determination of the ages and metallicities of intermediate-age single stellar populations.

27 pages with 10 figures. Accepted by the Astronomical Journal

References in corpus (4)

• Astrometry with Hubble Space Telescope: A Parallax of the Fundamental Distance Calibrator delta Cephei
• Testing intermediate-age stellar evolution models with VLT photometry of LMC clusters. III. Padova results
• NGC 1866: a workbench for stellar evolution
• Testing intermediate-age stellar evolution models with VLT photometry of LMC clusters. II. Analysis with the Yale models

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