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Binary central stars

Altogether 35 central stars have been recognized as binaries up till now, partly resolved as visual binaries (see Ciardullo et al., 1999) and partly known as close binary nuclei (Bond, 2000). They are listed in the following table; observers should be encouraged to make more observations of central stars because the percentage of known binaries is much smaller compared with that of the ``common'' stars. There would also be an opportunity to get further individual distances of PNe.

List of binary central stars

Lubos Kohoutek