Paper:	Binaries among the blue stragglers in M67
Volume:	13, The Formation and Evolution of Star Clusters
Page:	424
Authors:	Milone, Alejandra A. E.; Latham, David W.; Kurucz, Robert L.; Morse, Jon A.
Abstract:	We have used calculated spectra as templates to derive radial velocities for 11 of the classical blue stragglers in M67 by cross-correlations. The mean velocities for all eleven stars are close to the cluster mean, thus confirming their membership in the cluster. For the blue straggler F190 we derive a spectroscopic orbit with period 4.1829 d, eccentricity 0.21, and mass function 1.6 x 10 exp -3 solar mass. Thus F190 is a good candidate for a blue straggler that resulted from mass transfer in a close binary. Several of the other blue stragglers show evidence for low-amplitude velocity variations.

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