Computer Science
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992hst..prop.5226s&link_type=abstract
HST Proposal ID #5226
Computer Science
Hst Proposal Id #5226
Scientific paper
We have discovered an extremely large population of blue stragglers (on HST Science Verification focus frames) at the very center of 47 Tucanae. The extraordinarily high surface density we found is in stark contrast with Hesser et al's almost complete lack of detection of blue stragglers further from the core. We are proposing to use the PC to map the distributions of blue stragglers in seven globular clusters of systematically increasing central density. Our goals are to determine and to compare the numbers, mean masses and distributions of the blue stragglers in globulars of widely differing central density. These observational results will be used to test theoretical predictions and numerical simulations of stellar density distributions and stellar collision rates in globular cluster cores. The proposed observations demand high spatial resolution imaging of moderately bright point sources near 3000 Angstroms...exactly what HST does best. Most of the target clusters are in, or close to, HST's Continuous Viewing Zone. Thus the proposed observations can make high efficiency use of HST time. In the event of a serious PC failure, (e.g. worsening contamination for the F284W filter) these observations can be carried out with the F439W filter of the PC, or with the F220W and F150W filters with FOC by doubling the allocated observing time.
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