086307

An accreting white dwarf in a cataclysmic binary is expected to experience a thermonuclear runaway resulting in a classical nova openParCNclosePar. Highly-enriched material ejected at high speeds will shock and heat the surrounding circumstellar medium. There is comma however comma very little evidence of diffuse X-ray emission from nova shells comma but for a few. We propose here to acquire the first X-ray observations of the CN shell IPHASX J210204.7+471015 openPara.k.a. J210204closePar recently discovered around an UX UMa nova-like system. The size comma distance comma and age of J210204 make it ideal for an X-ray investigation with XMM-Newton. The proposed EPIC observation will lead us to novel results on the characterisation of the interaction of hydrogen-poor comma metal-rich ejecta with the circumstellar medium.