A New View of the Supersoft X-Ray Source Cal 87 Observed with XMM-Newton
  Cal 87 was observed with XMM-Newton in April of 2003. The source shows a rich emission line spectrum, where lines can be identified if they are red-shifted by 700-1200 km/s. These lines seem to have been emitted in a wind from the system. The eclipse is observed to be shifted in phase by 0.03 phi(orb), where phi(orb) is the phase of the optical light curve. 
Marina Orio, Ken Ebisawa, John Heise and Wouter Hartmann