Where are the Dozens of Predicted Cataclysmic Variables in Globular Clusters?

Details Where are the Dozens of Predicted Cataclysmic Variables in Globular Clusters? Where are the Dozens of Predicted Cataclysmic Variables in Globular Clusters?

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6460s&link_type=abstract

HST Proposal ID #6460

Physics

Hst Proposal Id #6460 Binaries And Star Formation

Scientific paper

WFPC2 imaging of globular cluster cores provides us with a unique opportunity to detect erupting cataclysmic variables {CVs} because they should be relatively common in the core. Two body tidal capture theory predicts that all binary systems should be relatively common in globular clusters, up to several orders of magnitude greater in relative number than in the Galactic field. Among the most common binaries should be CVs because of the high presumed abundance of white dwarfs in globular cores. However, only a handful of confirmed CVs have been discovered in globular clusters to date. This paucity brings into question the dynamical theories which predict great numbers of CVs. We propose to image the cores of two globular clusters with WFPC2 at five epochs to detect outbursting CVs - dwarf novae {DN}. We also propose to retrieve from the archive globular cluster WFPC2 data, cycles 4 & 5, that were taken over multiple epochs to search for erupting DN. At any given time 15 to find 30 two epochs. Clusters for which we have three or more epochs should yield > 50 DN exist in the cores of globular clusters will either support present dynamical theories or strongly constrain new theories that can adequately explain these results.

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