Fig. 3
Radius as a function of stellar age for the progenitor stars of three He WDs of mass 0.17, 0.21 and 0.24 M⊙. The most massive proto-WD evolves with hydrogen shell flashes – see inset. The epoch between the solid red star (RLO termination) and the open black star (max. Teff) marks the contraction (transition) timescale, Δtproto = 96−1910 Myr.
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