Core Collapse Deep Survey: NGC6397

Computer Science

Scientific paper

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Chandra Proposal Id #08300935

Scientific paper

We propose an ultra-deep survey of the core collapse cluster NGC 6397. At only 2.3kpc, it can be surveyed ~6X deeper (down to Lx=6E28 erg/s) than any globular done with Chandra (e.g. 47Tuc) and with significantly reduced central crowding. Combined with two very deep surveys (V~25-30) just conducted in HST cycle 13, we shall provide the first, and only possible, globular cluster survey for the lowest luminosity cataclysmic variables (CVs: AM CVns and Polars) and millisecond pulsars (MSPs) known in the field. The doubly-recycled MSP (and a second candidate) as well as magnetic CVs will be studied in detail. This compact binary survey will provide a complete census and set of identifications of a large fraction of the cluster's compact binaries, the central engine of core collapse.

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