Abstract
We present a deep CCD investigation of stars in a selected region near the center of the galactic cluster M11. The cluster photometry has been extended to objects about 7 mag fainter than previous investigations, reaching a limiting magnitude of V ∼ 22. The color-magnitude diagram, based on more than 5000 stars, reveals that the cluster main sequence (MS) appears well-populated down to, at least, V ∼ 20.5 and, perhaps, down to the observational limit. Assuming for the cluster E B−V = 0.42 mag, the best fit of the MS to Pleiades gives for M11 an apparent distance modulus (m−M) υ = 12.5 ± 0.2 mag, which implies a distance d = 1.7 ± 0.2 kpc. Relying on photometric criteria, one finds that the observed MS should be reasonably complete and free of contamination by field stars down to V ∼ 18 mag
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