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Hipparcos Observations of Hydrogen-deficient Carbon Stars ^*

Cottrell, P. L.; Lawson, W. A.

Parallax measurements for 21 hydrogen-deficient carbon stars have been made by the Hipparcos satellite. These stars include most of the brighter R Coronae Borealis (RCB) variables, other cool hydrogen-deficient carbon (HdC) stars, and several higher-T _eff extreme helium (eHe) stars. Most of these stars have either negative or statistica…