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We investigate whether the recently suggested rotation and crystallizationdriven dynamo can explain the apparent increase of magnetism in old metalpolluted white dwarfs. We find that the effective temperature distribution ofpolluted magnetic white dwarfs is in agreement with most/all of them having acrystallizing core and increased rotational velocities are expected due toaccretion of planetary material which is evidenced by the metal absorptionlines. We conclude that a rotation and crystallization driven dynamo offers notonly an explanation for the different occurrence rates of strongly magneticwhite dwarfs in close binaries, but also for the high incidence of weakermagnetic fields in old metal polluted white dwarfs.

Magnetic dynamos in white dwarfs -- II. Relating magnetism and pollution