Fig. 1
Mass fractions of carbon and oxygen in the core of a TPAGB star with initial
and Z = 0.02
obtained using the MESA code (Paxton et al.
2013) illustrating that the outermost layers with mass coordinate
m(r) ≳ 0.5 M⊙ of a
0.6 M⊙ CO-WD are expected to have C/O > 1 (by
number).
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