An Apparent Hard X-ray Decline of CH Cygni
  CH Cygni is a symbiotic star consisting of an M giant and an accreting white dwarf, which is known to be a highly variable X-ray source with a complex, two-component, spectra. Here we report on two Suzaku observations of CH Cyg, taken in 2006 January and May, during which the system was seen to be in a soft X-ray bright, hard X-ray faint state. Based on the extraordinary strength of the 6.4 keV fluorescent Fe K-alpha line, we show that the hard X-rays observed with Suzaku are dominated by scattering. 
Koji Mukai (1,2), Manabu Ishida (3), Caroline Kilbourne (1), Hideyuki   Mori (4), Yukikatsu Terada (5), Kai-Wing Chan (1,2) ...