NEW CANDIDATE INTERMEDIATE-AGE STAR CLUSTERS IN THE SMALL MAGELLANIC CLOUD

PIATTI, ANDRÉS E.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

WILEY-BLACKWELL PUBLISHING, INC

Año: 2011 vol. 416 p. 89 - 93

0035-8711

We present the results on the age and metallicity estimates of nine Small Magellanic Cloud(SMC) clusters (AM 3, HW 31, 40, 41, 42, 59, 63, L91 and NGC 339) obtained from CCDWashington CT 1 T 2 photometry. We confirm AM 3 and NGC 339 as intermediate-age andmetal-poor clusters, and report for the first time that the remaining seven clusters are alsointermediate-age or old clusters (t ∼ 4.3–9.3 Gyr), which represents an increase of 60 percent of the total known intermediate-age/old cluster population in the SMC. The studiedclusters have metal contents ranging from intermediate metal-poor ([Fe/H] ≈ −0.7 dex) downto metal-poor ([Fe/H] ≈ −1.3 dex) values.