Computer Science
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9911b&link_type=abstract
HST Proposal ID #9911
Computer Science
Hst Proposal Id #9911 Stellar Populations
Scientific paper
We plan to analyze 636 F555W and 653 F814W images of 47 Tuc taken during observation run GO-8267. We will construct an accurate main sequence CMD using all the data in an optimal way. By analyzing the results with extensive artificial star tests, we will: {1} calculate the binary frequency in the cluster, {2} calibrate the binary period distribution by comparing with the known population of short-period eclipsing binaries, {3} determine the unevolved single-star main sequence luminosity function, and {4} identify the BY Dra candidates classified by X-ray spectra and temporal characteristics {X-ray and/or optical} . The results are essential in the studies of stellar dynamics, stellar population, and origins of dynamically interesting objects. We have developed robust data reduction techniques and applied them successfully in similar HST/WFPC2 studies. If this proposal is accepted, the results obtained will form a major component of graduate student Bing Zhao's Ph.D. thesis.
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