Chen and Hansen argued that the presence of convection complicates the cooling of old WDs with thin layers on hydrogen on their surfaces. As the white dwarf ages the convective zone grows downward and mixes helium into the photosphere, turning a DA white dwarf into a DB white dwarf.
arXiv:1010.3376 [pdf, ps, other] Title: Old White Dwarf Stars with Some Hydrogen -- Cooling Curves
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