A reanalysis of the strongly metal-blanketed DZ white dwarf G165-7 is presented .
An improved grid of model atmospheres and synthetic spectra is used to analyze BVRI , JHK , and ugriz photometric observations as well as a high quality Sloan Digital Sky Survey spectrum covering the energy distribution from 3600 to 9000 Å .
The detection of splitting in several lines of Ca , Na , and Fe , suggesting a magnetic field of B _ { s } \sim 650 kG , is confirmed by spectropolarimetric observations that reveal as much as \pm 7.5 % circular polarization in many of the absorption lines , most notably Na , Mg , and Fe .
Our combined photometric and spectroscopic fit yields T _ { eff } = 6440 K , \log g = 7.99 , \log ( { H / He } ) = -3.0 and \log ( { Ca / He } ) = -8.1 .
The other heavy elements have solar ratios with respect to calcium , with the exception of Na and Cr that had to be reduced by a factor of two and three , respectively .
A crude polarization model based upon the observed local spectral flux gradient yields a longitudinal field of 165 kG , consistent with the mean surface field inferred from the Zeeman splitting .
The inclusion of this weak magnetic field in our synthetic spectrum calculations , even in an approximate fashion , is shown to improve our fit significantly .