Cooling times for all our helium-enhanced sequences with Z = 0.001 and initial helium mass fractions Y = 0.4. Red and blue lines correspond to white dwarfs with helium and C/O cores, respectively. The solid green line corresponds to a helium-core white dwarf of mass 0.435 M⊙ resulting from a progenitor with Z = 0.01 and a standard initial helium abundance (Althaus et al. 2013), whilst the dashed green line corresponds to helium-core white dwarfs of mass 0.449 M⊙ resulting from a progenitor with Z = 0.001 and a standard initial helium abundance (Serenelli et al. 2002).
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