X-ray emission line spectroscopy of cataclymic variables. II. Temperature and densities from line ratios in the Chandra HETG band

Schlegel, E. M. ; Shipley, H. V. ; Rana, V. R. ; Barrett, P. E. ; Singh, K. P. (2014) X-ray emission line spectroscopy of cataclymic variables. II. Temperature and densities from line ratios in the Chandra HETG band The Astrophysical Journal, 797 (1). p. 38. ISSN 0004-637X

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Official URL: http://iopscience.iop.org/article/10.1088/0004-637...

Related URL: http://dx.doi.org/10.1088/0004-637X/797/1/38

Abstract

We summarize the results of a line-by-line fitting analysis of the available spectra obtained using the Chandra High-Energy Transmission Grating. We confirm the existence of broad ionization and electron temperature ranges and high number densities in cataclysmic variables (CVs) of all subtypes. Temperatures range from ~0.4 keV to ~5-10 keV or more with a broad range detected in any given CV. In other words, single-temperature models do not describe the line emission. Number densities also cover a broad range, from 1012 to >1016 cm–3. We demonstrate that much of the plasma is in a nonequilibrium state; the Fe emission, however, may arise from plasma in the ionization equilibrium.

Item Type:Article
Source:Copyright of this article belongs to American Astronomical Society.
Keywords:Novae; Cataclysmic Variables; Stars: Dwarf Novae; X-rays: Binaries
ID Code:99137
Deposited On:20 Oct 2015 06:50
Last Modified:20 Oct 2015 06:51

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