An Apparent Hard X-ray Decline of CH Cygni

arxiv: astro-ph/0609245 · v1 · pith:CHMBOVJHnew · submitted 2006-09-08 · 🌌 astro-ph

An Apparent Hard X-ray Decline of CH Cygni

Koji Mukai (1 , 2) , Manabu Ishida (3) , Caroline Kilbourne (1) , Hideyuki Mori (4) , Yukikatsu Terada (5) , Kai-Wing Chan (1 , Yang Soong (1

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2) ((1) NASA/GSFC (2) USRA (3) Tokyo Metropolitan University (4) Kyoto University (5) RIKEN)

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keywords x-rayhardcygnisuzakuaccretingapparentbrightcomplex

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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.

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An Apparent Hard X-ray Decline of CH Cygni

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