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Located mostly in the halo surrounding the galactic plane they comprise the oldest stars in the galaxy.These Population II stars are highly evolved but with low metallicities.
They are sometimes called galactic clusters due to their location on the dusty spiral arms on the plane of spiral galaxies.
Stars in an open cluster have a common origin - they formed from the same initial giant molecular cloud.
Clusters typically contain a few hundred stars though this can vary from as low as a few dozen up to a few thousand.
Some, such as the Pleiades still show evidence of nebulosity suggesting their recent formation.
Open cluster stars belong to Population I, they are young and have high metallicities.