Cyclotron absorption in GD 229?

A two-component magnetic-field model is used to investigate the possibility that cyclotron absorption is responsible for the strong feature observed at 4185 A in the rich optical spectrum of the polarized white dwarf GD229. A series of model atmospheres with an effective temperature of 12,000 K, log g of 8.0, and a polar field strength of 260 million G is computed. Results are evaluated for different values of a parameter that represents the degree of magnetic-field uniformity.