----- Submission 1 (Fri May 13 16:57:24 GMT 2005) -----
Assigned ID: 608
----- Submission 1 (Sat Jan 22 00:28:53 GMT 2005) -----
Timing Studies of the X-ray Binary Populations in Globular Clusters
Close binaries are fundamental to the dynamical stability and evolution of globular clusters, but large populations have been extremely difficult to identify. Chandra X-ray images provide a revolutionary resource, revealing a few to dozens of low-luminosity X-ray sources in every cluster deeply examined; our own Chandra programs uniformly study these ubiquitous X-ray sources (close binaries and their progeny) in a dozen clusters. We have obtained multicolor, single-epoch, ACS images, from which to obtain initial optical counterparts, especially CVs (the dominant population in most clusters), BY Dra's, and qLMXBs. As HST capability for follow-on, confirming, spectra of our multicolor-selected counterparts is now severely curtailed, we propose an ACS time-series imaging program that will yield equivalent follow-on information for 5 of our clusters. The proposed ACS time-series data with 6 min resolution and 8 hr time-span, will: provide variability information to secure our suggested multicolor identifications; allow secure classifications of the various X-ray subpopulations (e.g., CVs vs. BY Dra's); yield quality lightcurves, whose shape will help test the notion that magnetic CVs are more common in globular clusters than the field; and, provide interesting contraints on the period distributions of cluster X-ray binaries.
ACS B-band time series images (typically 6 exposures of about 340s each per orbit) will be taken during 5 orbits in each of 5 globular clusters observed previously with Chandra and HST. Dithers are used to improve data quality and fill the ACS chip gaps.
HOT STARS
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