Gemini/GMOS photometry of intermediate-age star clusters in the Large Magellanic Cloud

A.E. PIATTI; S.C. KELLER, A.D. MACKEY, G.S. DA COSTA

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

WILEY-BLACKWELL PUBLISHING, INC

Lugar: Londres; Año: 2014 vol. 444 p. 1425 - 1441

0035-8711

We present Gemini South GMOS $g,i$ photometry of 14 intermediate-age Large Magellanic Cloud (LMC) star clusters, namely: NGC,2155, 2161, 2162, 2173, 2203, 2209, 2213, 2231, 2249, Hodge,6, SL,244, 505, 674, and 769, as part of a continuing project to investigate the extended Main Sequence Turnoff (EMSTO) phenomenon. Extensive artificial star testswere made over the observed field of view. These tests reveal the observed behaviour of photometric errors with magnitude and crowding. The cluster stellar density radial profiles were traced from star counts over the extent of the observed field.We adopt cluster radii and build colour-magnitude diagrams (CMDs) withcluster features clearly identified.We used the cluster ($g,g-i$) CMDs to estimate ages from the matching of theoretical isochrones. The studied LMC clusters are confirmed to be intermediate-ageclusters, which range in age 9.10 $<$ log($t$) $<$ 9.60. NGC,2162 and NGC,2249 look like new EMSTO candidates, in addition to NGC,2209, on the basis of having dual red clumps.