Optical and infrared photometric study of four galactic open clusters

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

Salta

Congreso; 53 Reunion Anual de la Asociacion Argentina de Astronomia; 2010

IATE - UNS

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 (<= 4 arcmin) OCs highly contaminated by field stars. We have de- rived their angular radii, reddenings, heliocentric distances and ages. Using 2MASS data, we confirmed the consistency between the 2MASS photom- etry 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).