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Fig. 1.

image

Kippenhahn diagrams following the evolution of M1 (left) and M2 after core helium depletion. Blue shaded areas indicate regions in which nuclear burning occurs, i.e. locations for which the nuclear energy ϵnuc exceeds energy losses due to neutrino emission, ϵν. Grey regions are subject to convective mixing. t = 0 corresponds to the onset of core helium burning.

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