Primera determinación de los parámetros fundamentales de 41 cúmulos estelares débiles de la Nube Mayor de Magallanes

T. PALMA, J.J. CLARIA, D. GEISLER, A.V. AHUMADA

Tandil

Congreso; 56 Reunión Anual de la Asociación Argentina de Astronomía; 2013

We present results obtained for 41 faint star clusters located in the bar and the disc of the Large Magellanic Cloud (LMC). The observations were carried out with the Vıctor Blanco 4 m telescope at Cerro Tololo Inter-American Observatory using the Washington C and Kron-Cousins R filters. Clusters linear radii were determined from the stellar density radial profiles. Using theoretical isochrones, we derived ages and metallicities from extracted (C − T1 , T1 ) color-magnitude diagrams, previously cleaned from field star contamination. Whenever possible, we also derived ages using the δT1 parameter and estimated metallicities from the Standard Giant Branch procedure. We find that the two methods for both age and metallicitiy determination are in good agreement with each other. Since none of the observed clusters has been previously studied,the present fundamental parameter determinations turn out to be the first ones. Seventeen clusters were found to be intermediate-age clusters (1-2 Gyr), with [Fe/H] values ranging from -0.4 to -0.8. The remaining 24 clusters are aged between 125 and 900 Myr and their metallicities range between 0.0 and -0.4.