Abstract
Recent observations show that the white dwarfs (WDs) in cataclysmic Variables
(CVs) have an average mass significantly higher than isolated WDs and WDs in
post-common envelope binaries (PCEBs), which are thought to the progenitors of
CVs. This suggests that either the WDs have grown in mass during the PCEB/CV
evolution or the binaries with low-mass WDs are unable to evolve to be CVs. In
this paper, we calculate the evolution of accreting WD binaries with updated
hydrogen accumulation efficiency and angular momentum loss prescriptions. We
show that thermal timescale mass transfer is not effective in changing the
average WD mass distribution. The WD mass discrepancy is most likely related to
unstable mass transfer in WD binaries in which an efficient mechanism of
angular momentum loss is required.
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