Paper:	Physical and Wind Properties of [WC] Stars
Volume:	391, Hydrogen-Deficient Stars
Page:	83
Authors:	Crowther, P.A.
Abstract:	We review the properties of carbon-sequence ([WC]) Wolf-Rayet central stars of planetary nebulae (CSPNe). Differences between the subtype distribution of [WC] stars and their massive WC cousins are discussed. We conclude that [WO]-type differ from early-type [WC] stars as a result of weaker stellar winds due to high surface gravities, and that late- and early-type [WC] and [WO] stars generally span a similar range in abundances, X(He)∼X(C)≫X(O), consistent with a late thermal pulse, and likely progenitors to PG1159 stars.

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