2009A&A...500..867S

We report the discovery of the ninth pre-polar consisting of a late-type ZAMS secondary and a magnetic white dwarf. The white dwarf accretes at an extreme low rate, {dot}(M)∼10^–14M_☉/yr, from the wind of the companion donor star. The source was found in our systematic search for WD/MS binaries within SDSS/SEGUE. Based on seven Sloan spectra we estimate a binary period of ∼200, 230, or 270min. The UV to IR spectral energy distribution was decomposed into a dM3-dM4 ZAMS secondary and a cool white dwarf, ∼9000K, which consistently imply a distance between 360 and 420pc. The optical spectrum displays one pronounced cyclotron hump, likely originating from a low-temperature plasma, ∼1keV, in a field of 108MG. We comment on the evolutionary link between polars and pre-polars.