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We report the discovery of a new magnetic DA white dwarf (WD), WD0011-721,which is located within the very important 20pc volume-limited sample of theclosest WDs to the Sun. This star has a mean field modulus <|B|> of 343 kG, andfrom the polarisation signal we deduce a line-of-sight field component of 75kG. The magnetic field is sufficiently weak to have escaped detection inclassification spectra. We then present a preliminary exploration of the dataconcerning the frequency of such fields among WDs with hydrogen-richatmospheres (DA stars). We find that 20 +- 5% of the DA WDs in this volume havemagnetic fields, mostly weaker than 1 MG. Unlike the slow field decay foundamong the magnetic Bp stars of the upper main sequence, the WDs in this sampleshow no evidence of magnetic field or flux changes over several Gyr.

A new weak-field magnetic DA white dwarf in the local 20 pc volume. The frequency of magnetic fields in DA stars