Globular Cluster Core Imaging

Details Globular Cluster Core Imaging Globular Cluster Core Imaging

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5324y&link_type=abstract

HST Proposal ID #5324

Physics

Optics

Hst Proposal Id #5324 Cool Stars Old Clusters

Scientific paper

This proposal requests short WFPC2 exposures of the centers of M15 M30 and NGC6244 to test and extend conclusions that are based upon existing HST images of M15 taken with a spherically-aberrated PSF. These HST observations show (Yanny et al 1993) that M15 has either a power-law density cusp with slope consistent with a central black hole or an as-yet-unresolved core of radius less than 1.5 arcseconds. Corrected optics will allow the determination of the density profile to a radius of less than 0.3 arcsec (0.02 pc), well within the region (0.8 to 1.6 arcsec) in which binary heating and core oscillations are expected to produce a flattened core. Exposures in three bands (F569W, F439W and F336W) will permit the detection of more than 100 stars to B=22 mag in the innermost radial bins for M15 (a 7-fold improvement), with similar results expected for M30 and NGC6244. The multi-color observations permit determination of the relative fractions of blue straggler, horizontal branch and red giant branch stars in each of the clusters to levels of unprecedented accuracy, allowing one to put useful constraints on models of radial segregation.

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