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The dynamical mass of a star cluster can be derived from the virial theorem,using the measured half-mass radius and line-of-sight velocity dispersion ofthe cluster. However, this dynamical mass may be a significant overestimationof the cluster mass if the contribution of the binary orbital motion is nottaken into account. In these proceedings we describe the mass overestimation asa function of cluster properties and binary population properties, and brieflytouch the issue of selection effects. We find that for clusters with a measuredvelocity dispersion of sigma > 10 km/s the presence of binaries does not affectthe dynamical mass significantly. For clusters with sigma < 1 km/s (i.e.,low-density clusters), the contribution of binaries to sigma is significant,and may result in a major dynamical mass overestimation. The presence ofbinaries may introduce a downward shift of Delta log(L/Mdyn) = 0.05-0.4 in thelog(L/Mdyn) vs. age diagram.

How do binaries affect the derived dynamical mass of a star cluster?