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We report results from a continuation of our searches for high field magneticwhite dwarfs paired in a detached binary with non degenerate companions. Wemade use of the Sloan Digital Sky Survey DR7 catalog of Kleinman et al. (2013)with 19,712 spectroscopically-identified white dwarfs. These include 1,735white dwarf plus M dwarf detached pairs (almost 10\% of the Kleinman at al.'slist). No new pairs were found, although we did recover the polar (AM~Herculissystem) ST\,LMi in a low state of accretion. With the larger sample theoriginal situation reported ten years ago remains intact now at a much higherlevel of statistical significance: in the selected SDSS sample, high fieldmagnetic white dwarfs are not found in an apparently-detached pairing with an Mdwarf, unless they are a magnetic CV in a low state of accretion. This findingstrengthens the case that the fields in the isolated high field magnetic whitedwarfs are generated by stellar mergers but also raises questions on the natureof the progenitors of the magnetic CVs.

Enigmas from the Sloan Digital Sky Survey DR7 Kleinman White Dwarf Catalog