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Using the relative proper motions and membership probabilities of 785 stars in the region of the open cluster M 11 (within 25 of the cluster center), we found for the cluster, a distance of 1659 pc, and an age of (1.8 - 2.2) 10 8 yr, a radius of about 24.5 pc, a luminosity mass of 4354 M , and a virial mass of 5000 M . A method is proposed to derive the present-day...
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