2004PASP..116.1056S

We present Far Ultraviolet Spectroscopic Explorer (FUSE) observations of the magnetic cataclysmic variable V405 Aurigae. Together with four other DQ Her-type binaries, V405 Aur forms a small subclass of intermediate polars that are likely to evolve into low magnetic field strength polars, similar to AM Her. Our co-added FUSE spectrum exhibits broad O VI and C III emission lines, in addition to a narrow O VI emission-line component that likely forms near the white dwarf surface. The O VI λ1032/λ1038 narrow emission-line flux ratio is near 2.0 throughout the orbit, which is indicative of its formation in an optically thin gas. Radial velocity measurements of the narrow O VI emission lines restrict any orbital modulation to a very low amplitude (K_WD=2.5±0.5 km/s), indicating, along with other single-peaked broad disk emission lines in the UV and optical, that the binary system is at low inclination.