van de Ven, G.; van den Bosch, R. C. E.; Verolme, E. K.; de Zeeuw, P. T.
“The dynamical distance and intrinsic structure of the globular cluster ω Centauri”
“We determine the dynamical distance D, inclination i, mass-to-light ratio M/L and the intrinsic orbital structure of the globular cluster ω Cen, by fitting axisymmetric dynamical models to the ground-based proper motions of van Leeuwen et al. and line-of-sight velocities from four independent data-sets. We bring the kinematic measurements onto a common coordinate system, and select on cluster membership and on measurement error. This provides a homogeneous data-set of 2295 stars with proper motions accurate to 0.20 mas yr-1 and 2163 stars with line-of-sight velocities accurate to 2 km s-1, covering a radial range out to about half the tidal radius…”