Volume 570, October 2014
|Number of page(s)||16|
|Section||Catalogs and data|
|Published online||21 October 2014|
The VMC Survey
XII. Star cluster candidates in the Large Magellanic Cloud⋆
Observatorio Astronómico, Universidad Nacional de Córdoba,
2 Consejo Nacional de Investigaciones Científicas y Técnicas, Av. Rivadavia 1917, C1033AAJ, Buenos Aires, Argentina
3 Instituut voor Sterrenkunde, Celestijnenlaan 200 D BUS 2401, 3001 Heverlee, Belgium
4 European Southern Observatory, Av. Alonso de Córdoba 3107, Casilla 19, Santiago, Chile
5 INAF, Osservatorio Astronomico di Padova, vicolo dell’ Osservatorio 5, 35122 Padova, Italy
6 University of Hertfordshire, Physics Astronomy and Mathematics, College Lane, Hatfeild AL10 9AB, UK
7 Leibniz-Institut für Astrophysik Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany
8 Kavli Institute of Astronomy and Astrophysics, Peking University, Yi He Yuan Lu 5, Hai Dian District, Beijing 100871, PR China
9 Department of Astronomy, Peking University, Yi He Yuan Lu 5, Hai Dian District, 100871 Beijing, PR China
10 ICRAR, University of Western Australia, 35 Stirling Hwy, Crawley, WA 6009, Australia
11 INAF, Osservatorio Astronomico di Bologna, via Ranzani 1, 40127 Bologna, Italy
12 INAF, Osservatorio Astronomico di Capodimonte, via Moiariello 16, 80131 Napoli, Italy
13 National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, 100012 Beijing, PR China
14 Lennard-Jones Laboratories, School of Physical and Geographical Sciences, Keele University, ST5 5BG, UK
Accepted: 18 July 2014
Context. In this work we analyse colour-magnitude diagrams (CMDs) of catalogued star clusters located in the Large Magellanic Cloud (LMC), from a YJKs photometric data set obtained by the Visible and Infrared Survey Telescope for Astronomy (VISTA) survey of the Magellanic Clouds system (VMC).
Aims. We studied a total of 98 objects of small angular size, typically ~11.6 pc in diameter projected towards both uncrowded tile LMC 8_8 and crowded tile LMC 5_5. They populate relatively crowded LMC fields with significant fluctuations in the stellar density, the luminosity function, and the colour distribution as well as uncrowded fields. This cluster sample is aimed at actually probing our performance in reaching the CMD features of clusters with different ages in crowded and uncrowded fields.
Methods. We applied a subtraction procedure to statistically clean the cluster CMDs from field star contamination. We then matched theoretical isochrones to the background-subtracted CMDs to determine the ages and metallicities of the clusters.
Results. We estimated the ages of 65 clusters, which resulted to be in the age range 7.3 <log (t/yr) < 9.55. We also classified as chance grouping of stars 19 previoulsy catalogued clusters, two possible cluster-like asterisms, and one unresolved cluster. For eight other objects, we could not find a clear star concentration in the Ks images either, so we quoted them as cluster-like asterisms. Finally, we found two previously catalogued single star clusters to be unresolved background galaxies (KMHK747, OGLE366), and one to be a triple cluster system (BSDL 2144).
Key words: techniques: photometric / Magellanic Clouds / galaxies: clusters: general
© ESO, 2014
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