X-Ray Line Beaming in Cataclysmic Variables due to Resonance Scattering

Galactic compact objects with extremely strong ionizedFe emission lines, with the equivalent width (EW) reaching\\sim 4000 eV, have been discovered with ASCA, includingAXvirgulJ1842.80423 and RXvirgulJ1802.1+1804.These objects are thought to be binary systems containingmagnetized white dwarf (WD). A possible interpretation ofthe strong FeK line is the linephoton beaming in the WDaccretion column, due to resonance scattering of line photonsaugmented by the vertical velocity gradient there. To firmlyestablish the proposed mechanism, an XMM observation of a similar system, AXvirgulJ2315592, is proposed. Uninterrupted coverage will accurately quantify how the line equivalent widths of many ion species change as the white dwarf rotates. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]