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Recently, a class of Roche-lobe-filling binary systems consisting of hotsubdwarf stars and white dwarfs with sub-hour periods has been discovered. Atpresent, the hot subdwarf is in a shell He burning phase and is transferringsome of its remaining thin H envelope to its white dwarf companion. As theevolution of the hot subdwarf continues, it is expected to detach, leavingbehind a low mass C/O core white dwarf secondary with a thick He layer. Then,on a timescale of $\sim 10$ Myr, gravitational wave radiation will again bringthe systems into contact. If the mass transfer is unstable and results in amerger and a catastrophic thermonuclear explosion is not triggered, it createsa remnant with a C/O-dominated envelope, but one still rich enough in He tosupport an R Corona Borealis-like shell burning phase. We present evolutionarycalculations of this phase and discuss its potential impact on the cooling ofthe remnant white dwarf.

astrophysical journal/the astrophysical journal

The final fates of close hot subdwarf - white dwarf binaries: mergers  involving He/C/O white dwarfs and the formation of unusual giant stars with  C/O-dominated envelopes