Optical photometry , spectroscopy and XMM-Newton ultraviolet and X-ray observations with full phase coverage are used for an in-depth study of WX LMi , a system formerly termed as a low-accretion rate polar .
We find a constant low mass accretion rate , \dot { M } \sim 1.5 \times 10 ^ { -13 } M _ { \odot } yr ^ { -1 } , a peculiar accretion geometry with one spot not being accessible via Roche-lobe overflow , a low temperature of the white dwarf , T _ { eff } < 8000 K and the secondary likely being Roche-lobe underfilling .
All this lends further support to the changed view on WX LMi and related systems as detached binaries , i.e .
magnetic post-common envelope binaries without significant Roche-lobe overflow in the past .
The transfer rate determined here is compatible with accretion from a stellar wind .
We use cyclotron spectroscopy to determine the accretion geometry and to constrain the plasma temperatures .
Both , cyclotron spectroscopy and X-ray plasma diagnostics reveal low plasma temperatures below 3 keV on both accretion spots .
For the low \dot { m } , high B plasma at the accretion spots in WX LMi , cyclotron cooling is dominating thermal plasma radiation in the optical .
Optical spectroscopy and X-ray timing reveal atmospheric , chromospheric and coronal activity at the saturation level on the dM4.5 secondary star .