Accretion of metal-poor gas from a circumbinary disc can reproduce the observed depletion patterns of 58 post-AGB stars, but only if initial accretion rates exceed about 3e-7 solar masses per year and disc masses approach 1e-2 solar masses.
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Modelling depletion by re-accretion of gas from a dusty disc in post-AGB stars
Accretion of metal-poor gas from a circumbinary disc can reproduce the observed depletion patterns of 58 post-AGB stars, but only if initial accretion rates exceed about 3e-7 solar masses per year and disc masses approach 1e-2 solar masses.