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(i) Temperature profiles in the white dwarf envelope for M·=10-10 (lower curve) and 10−9 M⊙ yr−1 (upper curve), for a 0.6-M⊙ white dwarf. (ii) Ratio of ohmic time to accretion time in the envelope for M·=10-10 (lower curve) and 10−9 M⊙ yr−1 (upper curve). The composition is solar for ΔM<10-5 M⊙, pure He for 10-5 M⊙<ΔM<10-2 M⊙, and C/O for ΔM>10-2 M⊙.

(i) Temperature profiles in the white dwarf envelope for M·=10-10 (lower curve) and 10−9 M⊙ yr−1 (upper curve), for a 0.6-M⊙ white dwarf. (ii) Ratio of ohmic time to accretion time in the envelope for M·=10-10 (lower curve) and 10−9 M⊙ yr−1 (upper curve). The composition is solar for ΔM<10-5 M⊙, pure He for 10-5 M⊙<ΔM<10-2 M⊙, and C/O for ΔM>10-2 M⊙.

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