Computer Science
Scientific paper
Feb 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999noao.prop..390p&link_type=abstract
NOAO Proposal ID #1999A-0390
Computer Science
Scientific paper
The binary fraction is a fundamental parameter of any stellar population. For dense stellar systems like globular clusters, it is also an essential ingredient for realistic models of their dynamical evolution. We propose to use the Rutgers Imaging Fabry-Perot (RFP) and 1.5m telescope to measure third-epoch radial velocities accurate to 1-5 km s^-1 for large numbers of stars in the globular clusters NGC 2808, NGC 3201, and NGC 5139 (ω Cen). Combining these velocities with previous measurements will enable us to improve dramatically upon published estimates of the binary fractions. Preliminary estimates demonstrate that binary fractions appear to be substantially higher in the low-mass, low-density clusters than in massive, high-dispersion clusters. Such cluster-to-cluster differences in binary fraction have recently been interpreted as evidence for the ongoing disruption of soft binaries in dense environments (Cote et al. 1996). However, the conclusions are complicated by the large uncertainties in the existing determinations of the binary fractions caused by small sample sizes and/or limited time coverage.
Cote' Patrick
Fischer Philippe
Gebhardt Karl
Pryor Carlton
Williams Theodore
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