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Paper: The Fe XXII I(11.92 Å)/I(11.77 Å) Density Diagnostic
Volume: 315, Magnetic Cataclysmic Variables (IAU Colloquium 190)
Page: 124
Authors: Mauche, C.W.; Liedahl, D.A.; Fournier, K.B.
Abstract: Using the Livermore X-ray Spectral Synthesizer, which calculates spectral models of highly charged ions based on HULLAC atomic data, we investigate the temperature, density, and photoexcitation dependence of the I (11.92 Å)/ I (11.77 Å) line ratio of Fe xxii. Applied to the Chandra HETG spectrum of the intermediate polar EX Hya, we find that the electron density of its Te ≈ 12 MK plasma is log ne (cm-3) = 14.3+0.7−0.5, orders of magnitude greater than that observed in the Sun or other late-type stars.
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