Helium-core White Dwarfs and Cataclysmic Variables in NGC 6752: New Clues to the Dynamical Evolution of Globular Clusters

Details Helium-core White Dwarfs and Cataclysmic Variables in NGC 6752: New Clues to the Dynamical Evolution of Globular Clusters Helium-core White Dwarfs and Cataclysmic Variables in NGC 6752: New Clues to the Dynamical Evolution of Globular Clusters

Jul 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009hst..prop12254c&link_type=abstract

HST Proposal ID #12254. Cycle 18

Computer Science

Scientific paper

We propose to search for binary stars containing white dwarfs in the post-core-collapse globular cluster NGC 6752 whose unusual dynamical status has yet to be fully explained. Using F435W, F625W and F658N filters with ACS/WFC, our search will be sensitive to double-degenerate binaries of the type we have recently uncovered in NGC 6397, which contain helium-core white dwarfs {WDs} paired with probable heavy carbon-oxygen WDs. We will use He WDs found in NGC 6752 to set new constraints on binary populations in the cluster and, by comparing them to those in NGC 6397, illuminate the role of binaries in the dynamical history of both clusters. The proposed H-alpha imaging will also enable us to search for optical counterparts of numerous as-yet unidentified X-ray sources in our deep Chandra imaging; these are likely to be a mixture of cataclysmic variables {CVs}, active binaries, and millisecond pulsars. We will determine whether NGC 6752 harbors a class of very faint CVs as have been recently found in the field and in NGC 6397. Those in NGC 6397 have been interpreted as an old population that formed near the cluster center and migrated outward as it aged, in contrast to the bright young CVs that reside close to the center. We will test for a similar pattern of spatial distribution with CV magnitude in NGC 6752.;

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