A Complete Study of Binaries and X-ray Sources in the Globular Cluster 47 Tucanae

Details A Complete Study of Binaries and X-ray Sources in the Globular Cluster 47 Tucanae A Complete Study of Binaries and X-ray Sources in the Globular Cluster 47 Tucanae

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9199g&link_type=abstract

HST Proposal ID #9199

Computer Science

Hst Proposal Id #9199 Stellar Populations

Scientific paper

As one of the closest and most massive Galactic globular clusters, and with a concentrated core, 47 Tuc has a diverse array of binary species including 20 millisecond pulsars, 9 X- ray sources, dozens of blue stragglers and 9 eclipsing binaries. Our already obtained data includes sensitive V/I time series and easily the deepest X-ray {Chandra} data ever obtained for 47 Tuc, but precise absolute photometry from HST is desired to extend and complete our binary studies. By analyzing two WFPC2 observations in the HST archive we plan to: {1} make the first photometric determination of the main sequence binary population in this cluster {this is a fundamental quantity, since MS binaries are the basic fuel for all of the accreting and compact binaries listed above}, {2} confirm and extend our recent discovery of a new form of binary in this cluster, main sequence/giant star binaries, and {3} complement our Chandra and HST time series observations of this superb GC by identifying counterparts to X-ray sources {on the basis of color and variability}, and searching for and studying He WDs and MSP counterparts in this cluster. Here, we have already made startling progress with the recent exciting discovery of a counterpart for the second brightest X-ray source in 47 Tuc, X5, a possible qLMXB, and the possible detection of He WDs. The results of these studies should have powerful ramifications for the evolution and dynamics of GCs.

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