The isolated magnetic white dwarfs G99 -47, KUV 813-14 (KUV 23162-1220), and G227-35 were observed in linear and circular spectropolarimetry and then compared to calculated theoretical spectra to find a model for the magnetic field strength and structure. The comparisons were to Stokes V/I (circular polarization) spectra in addition to total flux Fλ, and these add many constraints to the possible solutions. An off-centered dipole or a dipole + quadrupole configuration best fits the observations, and this is consistent with the idea that the magnetic Ap and Bp stars also showing deviations from a centered dipolar field are the predecessors of the highly magnetic white dwarfs. A good fit to the flux spectrum alone is possible in more than one region of parameter space. The addition of circular polarization data to our comparisons caused the parameters we found for G99-47 and KUV 813-14 to be somewhat different from previous solutions.
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Putney et al. (1995) studied this question.