Estimación de edades de 15 cúmulos estelares de la Nube Menor de Magallanes

M.C. PARISI; D. GEISLER; A.E. PIATTI; A. GROCHOLSKI; A. SARAJEDINI

Salta, Argentina

Congreso; 53º Reunión Anual de la Asociación Argentina de Astronomía; 2010

Asociación Argentina de Astronomía

By using V and I images obtained with the "Very Large Telescope" (Chile) for 15 star clusters in the Small Magellanic Cloud (SMC), we estimated their ages from the deltaV parameter, which is defined as the difference be- tween the visual magnitude of the horizontal branch (or "clump") and the corresponding visual magnitude of the turn off. We first performed the PSF photometry and then built the colour-magnitude diagrams of the clusters wherein we measured V . This parameter, expressed in magnitudes, was calibrated by Salaris, Weiss & Percival (2004) as a function of age. The ages here estimated for the 15 clusters, together with the metallicities we had previously derived applying the CaII triplet technique, allowed us to reanalize the age-metallicity relationship in the SMC.