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

被引:15
|
作者
Piatti, Andres E. [1 ,2 ]
Keller, Stefan C. [3 ]
Dougal Mackey, A. [3 ]
Da Costa, Gary S. [3 ]
机构
[1] Univ Nacl Cordoba, Astron Observ, RA-5000 Cordoba, Argentina
[2] Consejo Nacl Invest Cient & Tecn, Buenos Aires, DF, Argentina
[3] Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia
基金
澳大利亚研究理事会;
关键词
techniques: photometric; galaxies: individual: LMC; Magellanic Clouds; MULTIPLE STELLAR POPULATIONS; YOUNG MASSIVE CLUSTERS; WASHINGTON PHOTOMETRY; FUNDAMENTAL PARAMETERS; SURROUNDING FIELDS; I; METALLICITIES; CLUMP;
D O I
10.1093/mnras/stu1535
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
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 turn-off (EMSTO) phenomenon. Extensive artificial star tests were 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) with cluster 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-age clusters, 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.
引用
收藏
页码:1425 / 1441
页数:17
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