Internal Velocity Distribution in Globular Clusters Part Two

Details Internal Velocity Distribution in Globular Clusters Part Two Internal Velocity Distribution in Globular Clusters Part Two

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992hst..prop.2944j&link_type=abstract

HST Proposal ID #2944

Computer Science

Hst Proposal Id #2944

Scientific paper

The goal of this project is to study the internal velocity dispersion for six globular clusters with a range of characteristics. We expect to determine the virial mass for each cluster and a kinematic distance (statistical parallax) where radial velocity observations exist. The radial and azimuthal components of the velocity distribution will be analyzed to determine the degree of anisotropy in the velocities as a function of distance from the cluster center for three of the clusters. In addition, the degree to which equipartition of energy exists among the various mass groupings will be studied from the bright giants down to one-half solar mass in three of the clusters. The observations are designed to yield an accuracy of +/- 1 km/sec in the derived cluster velocity dispersion at each location in the cluster for the nearer clusters and +/- 2 km/sec for the more distant clusters.

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