Paper:	18O and the Origins of HdC and R CrB Stars
Volume:	391, Hydrogen-Deficient Stars
Page:	51
Authors:	Geballe, T.R.; Clayton, G.C.; Asplund, M.; Herwig, F.; Fryer, C.
Abstract:	We have detected enormously enhanced 18O and correspondingly small values of 16O/18O in many hydrogen-deficient carbon (HdC) stars and R Coronae Borealis (R CrB) stars. The similar ratios suggest a common origin for the two types of stars. Of the two leading candidates for the origin of R CrB stars, white dwarf mergers and final helium flashes, the former appears more likely to produce this and other observed isotopic anomalies.

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