
Figure 10: Limits of different burning regimes of accreted hydrogen onto a CO WD as a function
of mass of the WD and accretion rate
[535]. If
, hydrogen burns steadily.
If
, H-burning shells are thermally unstable; with decrease of
the strength of
flashes increases. For
, hydrogen burns steadily but the excess of unburnt matter forms
an extended red-giant–sized envelope. In the latter case white dwarfs may lose matter by wind or
due to Roche lobe overflow. A dotted line shows the Eddington accretion rate
as a function
of
. The dashed lines are the loci of the hydrogen envelope mass at hydrogen ignition. Image
reproduced with permission from [535], copyright by AAS.






