The Mass of the Open Star Cluster M35 as Derived from Proper Motions

摘要: Proper-motion studies of several open and globular clusters have yielded accurate, two-component (radial tangential) velocity dispersion profiles for the brighest stars in these systems. It is shown that dispersions derived from proper motions, unlike those radial velocities, contain enough information to determine shape amplitude ellipsoid at all radii a spherical cluster. This information, turn, sufficient yield cluster potential without any additional assumptions about kinematics or mass-to-light ratio. data star M35 imply dynamical mass within central 3.75 pc between 1600 3200 solar masses (95 percent confidence), consistent with realistic stellar population same radius. 32 refs.