
Figure 14: Limits on different burning regimes of helium accreted onto a CO WD as a function
of the WD mass and accretion rate [590], Piersanti, Tornambé & Yungelson (in prep.). Above
the “RG Configuration” line, accreted He forms an extended red-giant–like envelope. Below
, accreted He detonates and the mass is lost dynamically. In the strong-flashes
regime, He-layer expands and mass is lost due to RLOF and interaction with the companion. Helium
accumulation efficiency for this regime is shown in Figure 15, and the critical He masses for WD
detonation are shown in Figure 28. Shaded region shows the domain of stable burning of accreted
hydrogen.
