Other
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992hst..prop.3851g&link_type=abstract
HST Proposal ID #3851
Other
Hst Proposal Id #3851
Scientific paper
We propose to obtain deep H-ALPHA and R exposures with the PC on the closest core-collapsed globular cluster, NGC 6397. This will allow the most sensitive search to date for cataclysmic variables (CVs) and other compact binaries in the core of this dynamically evolved cluster. The search is sensitive to CVs with increasingly faint luminosities, which are distinguished by increasingly strong H-ALPHA emission, and thus will provide the most definitive test yet for the possible deficit of CVs in globulars. Comparison of these images with archived HST uv images that we have recently received, with our ground-based H-ALPHA and uv images (for regions outside the core), and with our ROSAT x-ray images will allow the long-standing question of the nature of the population of low luminosity x-ray sources in globulars (CVs ?) to be probed in unprecedented detail. The search will also be sensitive to the populations and distributions of blue subdwarfs (H-ALPHA absorbers, and possibly WD-stellar merger products) and millisecond pulsar emission nebulae, so that models of binary formation and evolution in globulars will be tested.
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