Old Open Clusters as Tracers of Galactic Evolution
Open clusters (OC’s) are important to study the properties of the Galactic disk, since they offer information on ages, both absolute and relative, and on the metallicity evolution, both in space and time. In fact, OC’s are found in different regions of the disk, cover a large interval in age (from a few Myr to about 10 Gyr) and in metallicity (Z=Z0/20 to supersolar). Moreover, their ages and distances are accurate, much more than for any other disk object like e.g., single field stars. Also, since OC’s orbits do not generally take them too far away from their birthplaces, we may assume that their current position in the Galaxy is representative also of their original one, and that we are not smearing properties by mixing populations, always a problem when dealing with field stars
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