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Title: X-ray emission line spectroscopy of cataclysmic variables. II. Temperatures and densities from line ratios in the Chandra HETG band

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 10{sup 12} to >10{sup 16} cm{sup –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.
Authors:
;  [1] ;  [2] ;  [3] ;  [4]
  1. Department of Physics and Astronomy, University of Texas-San Antonio, San Antonio, TX 78249 (United States)
  2. Space Radiation Laboratory, Caltech, Pasadena, CA 91125 (United States)
  3. US Naval Observatory, Washington, DC 20392-5420 (United States)
  4. Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai (India)
Publication Date:
OSTI Identifier:
22370042
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 797; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; DENSITY; ELECTRON TEMPERATURE; EMISSION; EMISSION SPECTRA; EQUILIBRIUM; IONIZATION; IRON; KEV RANGE; NOVAE; PLASMA; POWER TRANSMISSION; SPECTRA; SPECTROSCOPY; X RADIATION