Optical and infrared photometric study of four galactic open clusters

A.E. PIATTI, J.J. CLARIÁ, A.V. AHUMADA

bol. asoc. arg. astron.

Claria,J.J., Alonso, V., Piatti, A.E.

Año: 2011 vol. 53 p. 153 - 156

0571–3285

We present CCD UBVI$_{KC}$ photometry for the open clusters (OCs) NGC,2311, Trumpler,6, NGC,2432 and BH,54. The resulting colour-magnitude and colour-colour diagrams as well as their radial density profiles show that these are small ($leq$ 4$arcmin$) OCs highly contaminated by field stars. We have derived their angular radii, reddenings, heliocentric distances and ages. Using 2MASS data, we confirmed the consistency between the 2MASS photometry scale and ours an also our photometric membership assessment of the cluster stars. A detailed version of this work can be seen in MNRAS, 408, 1147 (2010).