Abstract
We derived mass loss rates for 5 central stars (CS) having WC spectrum: NGC 5315, BD+30 3639, He2-99, He2-113, SwSt-1. The values are substantially higher than other previous estimates based on UV data. We consider that those stars have winds in which hydrogen is highly deficient (or absent) with helium and carbon being the dominant elements. The new mass loss rates reduce the timescale for the evolution along the horizontal track, but discrepancies with kinematic timescales still persist.
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