Extreme Ultraviolet Explorer and Optical Observations of the Magnetic Cataclysmic Variables RX J1015.5+0904 and V405 Auriga (RX J0558+5353)

We present simultaneous Extreme Ultraviolet Explorer (EUVE) and optical observations of one of the shortest orbital period AM Herculis systems (RX J1015.5+0904) and of one of the intermediate polars which shows a soft X-ray flux (V405 Aur=RX J0558+5353). RX J1015.5+0904 shows a very typical geometry of the accretion area for a one-pole system. The count rate is consistent with a column at the low end of the ROSAT determinations and, therefore, a relatively high temperature for the heated area. Thus, there is every indication that heating operates efficiently even at low accretion rates onto very cool white dwarfs. V405 Aur has a very low count rate, which does not allow a good determination of the spin variation at EUVE wavelengths, although it is obvious in the optical photometry. Doppler tomography of the optical spectra shows a trend of decreasing disk structure and increasing spot structure with increasing excitation, with a change in the location of the primary emitting zone from previous years.