The luminosity function of stars in the intermediate age open cluster NGC 7789
We report the results of a CCD investigation of stars in a selected region near the center of the intermediate age galactic cluster NGC 7789. A CM diagram is presented for a sample of 1122 stars, which should be complete down to V=20. On the ground of recent theoretical evolutionary models, simulations of both the colour-magnitude diagram and the
Martinez Roger, C. et al.
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10
1994