Computer Science
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6779g&link_type=abstract
HST Proposal ID #6779
Computer Science
Hst Proposal Id #6779 Stellar Populations
Scientific paper
We propose to obtain V and I photometry for the centrally- concentrated Galactic globular clusters M28 and NGC 5286 extending to slightly below the main-sequence turnoff. These data will yield color-magnitude diagrams and accurate stellar positions which we will use to precisely determine the radial and azimuthal structure of the clusters and to search for exotic stellar populations. The HST stellar positions will also increase the size, improve the accuracy, and eliminate several kinds of contamination from our large samples of ground-based Fabry-Perot stellar velocities for the two clusters. Combining the structure and kinematic data will allow us to derive accurate mass profiles for the two clusters, thus testing key predictions of the dynamical models for core collapse and constraining the population of heavy stellar objects in the clusters. Comparing the measured cluster rotation with flattening of star-count isopleths will let us search for changes in the axis of rotation with radius such as we have found in M15. M28 is of particular interest for dynamical studies because pulsar timing measurements suggest that it has a large mass-to-light ratio in its central region. NGC 5286 has a collapsed core and is rapidly rotating.
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