Abstract
A number of efforts are underway to detect close binary stars in planetary nebulae. The primary goal of these studies is to determine the binary fraction of central stars. The next stage is a detailed analysis of the binaries to determine physical parameters for the systems. These analyses can be combined with population synthesis models, common envelope evolution models, and observed properties of nebulae to further understand the impact of binarity on PN formation. I discuss the sample of known close binary central stars in relation to other close binaries with a white dwarf, cataclysmic variables, supernova Ia progenitors, and double degenerate systems.
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