Two Types of X-ray Spectra in Catalysmic Variables Revisited

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Stellar Spectroscopy

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In a 2003 paper, Mukai et al. presented the Chandra HETG spectra of 7 cataclysmic variables (CVs) then available in the public archive, and classified them into ``cooling flow'' and ``photoionized'' types. In this presentation, I will revisit this classification. It is clear that multi-temperature plasma exists in the post-shock region of accreting white dwarfs; I will discuss why the cooling flow model works well, and what its limitations are when applied to CVs. It is also clear that even the ``photoionized'' CVs are also powered by the same multi-temperature plasma. I will discuss how the appearance of a much harder continuum of these ``photoionized'' CVs is created by the complex intrinsic absorber. I will show that there is an additional soft emission in these systems that the multi-temperature plasma models cannot explain, and discuss what evidence there is for the photoionization origin of this component.

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