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We find a deficiency of binary stars moving on strongly retrograde Galacticorbits. No binary deficiencies are seen for U or W velocities, however. Fromtheoretical analyses, we rule out preferential disruption of pre-existingbinary stars due to encounters with massive perturbers. We also rule outglobular clusters as the source of the effect since prograde motions are morelikely to create such an effect. We search for star streams and find onepossible candidate, but it is not on a retrograde orbit and probably representsthe remains of a cluster that has passed too near the Galactic center. Based ona very small number of stars, we find that about the right fraction of stars onretrograde Galactic orbits share some chemical similarities to the clusteromega Cen, suggesting that its parent galaxy could be the explanation.Comment: To appear in the Astronomical Journal (March 2005 issue

the astronomical journal

A Survey of Proper-Motion Stars. XVII. A Deficiency of Binary Stars on Retrograde Galactic Orbits and the Possibility that ω Centauri is Related to the Effect