Spectroscopic Binaries in M67

Mathematics

Scientific paper

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Scientific paper

For more than 20 years we have been monitoring the velocities of stars in the old open cluster M67 using the CfA Digital Speedometers. Altogether we have accumulated 6920 exposures of 411 proper-motion member of the cluster. We now have orbital solutions for 87 spectroscopic binaries, compared to the 22 spectroscopic binaries (13 with orbital solutions) identified and analysed by Mathieu and Latham (AJ, 92, 1364, 1986). I will summarize the characteristics of this population of binaries, such as the distribution of eccentricity versus period, and the radial distribution in the cluster. I will then review the binary status of cluster members that appear in positions on the color-magnitude diagram where they are not expected according to standard single-star evolution.

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