Computer Science
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006noao.prop..583c&link_type=abstract
NOAO Proposal ID #2006B-0583
Computer Science
Scientific paper
We propose to carry out the first systematic study of the outburst properties and lightcurves of a large population of known cataclysmic variables (CVs) in a globular cluster. Using differencing imaging techniques we will monitor the 11 confirmed or probable CVs in NGC 6397 for dwarf nova outbursts. We will measure outburst frequencies, amplitudes and durations for a significant sample of CVs at known distance and shared metallicities. These data will provide new diagnostics against which to test theories concerning the apparent mismatch between the substantial numbers of CVs now known in quiescence in globulars and the small number of dwarf nova (DN) outbursts that have been seen. For the 6 brightest CVs in the cluster, we will also measure the overall lightcurve behavior, on a timescale that has not been sampled with either HST or ground-based observations, which will enable detailed comparisons to behaviors known among field CVs. A recent ground-based study that measured CV lightcurves and found one DN outburst in NGC 6397 (Kaluzny et al. 2006) demonstrates the feasibility of the proposed program.
Anderson Jeffrey
Callanan Paul
Cohn Haldan
Cool Adrienne
Lopez Liliana
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