Other
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7335g&link_type=abstract
HST Proposal ID #7335
Other
Hst Proposal Id #7335 Binary Stars
Scientific paper
The ultimate test for the total number and characteristics of cataclysmic variables {CVs} and compact binaries in the core of a globular cluster can best be conducted on the closest collapsed core cluster, NGC 6397. We propose to use our proven successful method of deep H Alpha {F656N} and R {F675W} imaging with WFPC2 to identify essentially all CV candidates down to M_V 12. This extends our WFPC1 discovery of emission line candidates in NGC6397, confirmed as CVs with FOS spectra, to virtually the entire CV luminosity function including the faintest magnetic systems which our FOS results suggest may be dominant in globulars. With interwoven V and I frames, we shall also constrain the CV disk vs. secondary star colors and thus masses of the secondary star and WD {lower limit}, allow for short-term variability searches, and constrain the {primordial} main sequence binary population for direct comparison with other clusters {e.g. NGC 6752}. Comparison with our deep ROSAT HRI image will identify still fainter dim x-ray sources as well as provide the optical identification data for our planned GTO observations of NGC 6397 with AXAF.
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