Wickramasinghe, DayalSchmidt, GaryFerrario, LiliaVennes, Stephane2015-12-130035-8711http://hdl.handle.net/1885/72653We use recent calculations of the Zeeman splitting of neutral helium lines and atmospheric models to investigate the properties of the magnetic DB white dwarfs in the field range 10-1000 MG. We confirm that GD 229 exhibits spectroscopic signatures indicative of neutral helium in a magnetic field of ∼500 MG, and argue that HE 1043-0502 may also be helium rich with an even higher field of ∼750 MG. The dominant features in the phase-averaged spectrum of the polarized magnetic white dwarf HE 1211-1707 correspond with those of Zeeman split neutral helium lines in a mean field of ∼50 MG, while the observed spectral variations point to a non-dipolar field structure.Keywords: Magnetic fields; Stars: Individual: GD 229; Stars: Individual: HE 1043-0502; Stars: Individual: HE 1211-1707; White dwarfs200210.1046/j.1365-8711.2002.05265.x2015-12-11