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Fig. 2

image

Illustration of the parameters of the prescription used for the mass accumulation efficiency (see Eq. (2)) at different mass accretion rates. In the area denoted by red-blue stripes, the upper limit for η = 0 differs for hot and cold models. The dash-dotted line applies to cold models and the dashed line to hot models. η is changed from 1 to 0 when the time-averaged accretion rate crosses the dash-dotted or dashed lines, while for all other lines the actual accretion rate is the deciding parameter. Note that the upper η = 1-regime denotes steady helium burning while the lower one denotes steady accumulation of helium on the CO core without nuclear burning.

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