Jeffery, Simon C; Karakas, Amanda; Saio, H
The surface abundances of extreme helium (EHe) and RCoronaeBorealis (RCB) stars are discussed in terms of a model for their origin in the merger of a carbon-oxygen white dwarf with a helium white dwarf. The model is expressed as a linear mixture of the individual layers of both constituent white dwarfs, taking account of the specific evolution of each star. In developing this recipe from previous versions, particular attention has been given to the intershell abundances of the asymptotic giant...[Show more]
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