Paper: astro-ph/0509125
Date: Tue, 6 Sep 2005 13:54:34 GMT (251kb)

Title: Open clusters in the Third Galactic Quadrant. II. The intermediate age
open clusters NGC 2425 and NGC 2635

Authors: A. Moitinho, G.Carraro, G. Baume, R. A. Vazquez

Comments: 10 pages, 13 figures. Figure quality has been quiet degraded.
Accepted by A&A
\\
We analyse CCD broad band (UBV(RI)c) photometric data obtained in the fields
of the poorly studied open clusters NGC 2425 and NGC 2635. Both clusters are
found to be of intermediate age thus increasing the population of open clusters
known to be of the age of, or older than, the Hyades. More explicitly, we find
that NGC 2425 is a 2.2 Gyr old cluster, probably of solar metallicity, located
at 3.5 kpc from the Sun. NGC 2635 is a Hyades age (600 Myr) cluster located at
a distance of 4.0 kpc from the Sun. Its Colour Magnitude Diagram reveals that
it is extremely metal poor for its age and position, thus making it a very
interesting object in the context of Galactic Disk chemical evolution models.

\\ ( http://arXiv.org/abs/astro-ph/0509125 , 251kb)