SCYON Abstract

Received on December 19 2005

CCD photometry of distant open clusters NGC 2425, Haffner 10 and Czernik 29

Authors	P. Pietrukowicz(¹), J. Kaluzny(¹) and W. Krzeminski(²)
Affiliation	(¹) Nicolaus Copernicus Astronomical Center, Warsaw, Poland (²) Las Campanas Observatory, Chile
Accepted by	Monthly Notices of the Royal Astronomical Society
Contact	pietruk@camk.edu.pl
URL	http://xxx.lanl.gov/abs/astro-ph/0510274
Links	NGC 2425 / Haffner 10 / Czernik 29

Abstract

We present BVI photometry for poorly known southern hemisphere open clusters: NGC 2425, Haffner 10 and Czernik 29. We have calculated the density profile and established the number of stars in each cluster. The colour-magnitude diagrams of the objects show a well-defined main sequence. However, the red giant clump is present only in NGC 2425 and Haffner 10. For these two clusters we estimated the age as 2.5±0.5 Gyr assuming metallicity of Z = 0.008. The apparent distance moduli are in the ranges 13.2 < (m-M)_V < 13.6 and 14.3 < (m-M)_V < 14.7, while heliocentric distances are estimated to be 2.9 < d < 3.8 kpc and 3.1 < d < 4.3 kpc, respectively for NGC 2425 and Haffner 10. The angular separation of 2.4 deg (150 pc at mean distance) may indicate a common origin of the two clusters.