Computer Science
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8219k&link_type=abstract
HST Proposal ID #8219
Computer Science
Hst Proposal Id #8219 Binary Stars
Scientific paper
We propose to carry out a deep, far-ultraviolet {FUV}, time- resolved, spectroscopic search for faint cataclysmic variables {CVs} in the globular cluster {GC} 47 Tuc. We will use STIS to carry out FUV slitless spectroscopy and imaging of this cluster at 6 epochs for a total of 30 HST orbits. Since crowding is not a problem in the FUV, this will yield time- resolved spectra and photometry of all UV-bright objects in the cluster core. Our CV census will be both deep enough to be essentially complete M_V{limit} eq 11 spectroscopically and eq 13 photometrically and ``broad'' enough to involve all of the following CV characteristics:, {1} UV brightness;, {2} blue FUV spectral shape;, {3} strong C iv 1550 Angstrom emission;, {4} He ii 1640 Angstrom emission {especially in magnetic systems};, {5} short time-scale { minutes} variability {flickering, WD spin};, {6} intermediate time-scale { hours} variability {orbital variations};, {7} long time- scale { weeks} variability {dwar f nova eruptions}., Tidal capture theory predicts that we should discover 40 CVs in 47 Tuc and spectroscopically confirm 25. These numbers are large enough to allow the first definitive test of the theory.
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