CCD SDSS gr photometry of poorly studied star clusters in the Large Magellanic Cloud

A.E. PIATTI

ISRN Astronomy and Astrophysics

Hindawy Publishing Corporation

Año: 2014 vol. 2014 p. 1 - 12

2090-4746

We present for the first time CCD SDSS $gr$ photometry, obtained at the Gemini South telescope with the GMOS attached,of stars in the field of the poorly studied star clusters NGC,1768, HS,85, SL,676,NGC,2107, NGC,2190, and SL,866, which are distributed in the main body ofthe Large Magellanic Cloud.We applied a subtraction procedure to statistically clean the cluster CMDs from field star contamination. In order to disentangle cluster features from those belonging to their surrounding fields,we applied a subtraction procedure which makes use of variable cells to reproducethe field star Color-Magnitude Diagrams (CMDs) as closely aspossible. We then traced their stellar density radial profiles from star countsperformed over the cleaned field stars dataset and derived their radii.Using the cleaned cluster CMDs, we estimated ages and metallicities from matching theoretical isochrones computed for the SDSS system. The studied star clusters have ages from 0.1 up to 2.0 Gyr and are of slightly metal-poor metal content ([Fe/H] $approx$ -0.4 dex).