Color-Magnitude Diagrams and the Internal Structure of the Globular Clusters NGC 5694 & NGC 5824

Details Color-Magnitude Diagrams and the Internal Structure of the Globular Clusters NGC 5694 & NGC 5824 Color-Magnitude Diagrams and the Internal Structure of the Globular Clusters NGC 5694 & NGC 5824

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5902f&link_type=abstract

HST Proposal ID #5902

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Hst Proposal Id #5902 Stellar Populations

Scientific paper

High stellar densities are produced in the cores of globular clusters through dynamical evolution. Recently, it has become clear that the physical characteristics of the stars in such cores can be modified, leading to the appearance of anomalous stellar populations. A study of these populations is important for furthering our understanding of the dynamical evolution of star clusters. The high spatial resolution imaging provided by HST is essential for uncovering and studying these anomalous stars. We propose to use the WFPC2 to make UBV observations of the central regions of two highly concentrated clusters, NGC 5694 and NGC 5824 for the primary purpose of studying the anomalous stellar populations revealed by our ground based images. These show bright, relatively blue quasi-stellar knots in the cluster cores. A large number of bright stars appear to the blue of the AGB/RGB in the cluster CMDs but, due to extreme crowding, we are unable to determine whether blue straggler stars are also present. These two targets are in the outer halo of the galaxy and the proposed HST observations will have a spatial resolution approximately equivalent to the best ground based images of NGC 6397. A secondary goal is to determine the ages for the two clusters through isochrone fitting and by application of differential measurements relative to other clusters of similar metallicity.

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