IAFE   05512
INSTITUTO DE ASTRONOMIA Y FISICA DEL ESPACIO
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Old star clusters in the Small Magellanic Clouds: last findings
Autor/es:
PIATTI, ANDRÉ E.
Lugar:
Perth
Reunión:
Workshop; The Magellanic System: in perspective; 2012
Institución organizadora:
ICRAR
Resumen:
We present CCD Washington CT1 photometry of nine SMC clusters, namely: AM3, HW31, 40, 41, 42, 59, 63, L91 and NGC339. The cluster ages wereestimated from measures of the difference in T1 magnitudes betweenthe red clump and the main sequence turnoff from the cluster CMDs, whereas the cluster metallicities were derived by comparing the clusterred giant branches (RGBs) with the standard fiducial RGBs tracedfor the Washington photometric system. Our results confirm AM3and NGC339 as intermediate-age and metal-poor clusters, and show forthe first time that the remaining seven clusters are also intermediate-ageor old clusters (t ~ 4.3-9.3 Gyr), which represents an increase of > 60% ofthe total known intermediate-age/old cluster population in the SMC. The metallicitties derived for the cluster sample range from intermediate metal-poor ([Fe/H]=-0.7 dex) down to metal-poor ([Fe/H]=-1.3 dex) values.