X-ray Light Curves and Accretion Disk Structure of EX Hydrae

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We present X-ray light curves for the cataclysmic variable EX Hydrae obtained with the Chandra High Energy Transmission Grating Spectrometer and the Extreme Ultraviolet Explorer Deep Survey photometer. We confirm earlier results on the shape and amplitude of the binary light curve and discuss a new feature: the phase of the minimum in the binary light curve, associated with absorption by the bulge on the accretion disk, increases with wavelength. We discuss several scenarios that could account for this trend and conclude that, most likely, the ionization state of the bulge gas is not constant, but rather decreases with binary ... continued below

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Hoogerwerf, R; Brickhouse, N S & Mauche, C W April 12, 2005.

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We present X-ray light curves for the cataclysmic variable EX Hydrae obtained with the Chandra High Energy Transmission Grating Spectrometer and the Extreme Ultraviolet Explorer Deep Survey photometer. We confirm earlier results on the shape and amplitude of the binary light curve and discuss a new feature: the phase of the minimum in the binary light curve, associated with absorption by the bulge on the accretion disk, increases with wavelength. We discuss several scenarios that could account for this trend and conclude that, most likely, the ionization state of the bulge gas is not constant, but rather decreases with binary phase. We also conclude that photoionization of the bulge by radiation originating from the white dwarf is not the main source of ionization, but that it is heated by shocks originating from the interaction between the in-flowing material from the companion and the accretion disk. The findings in this paper provide a strong test for accretion disk models in close binary systems.

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PDF-file: 21 pages; size: 0.3 Mbytes

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  • Journal Name: Astrophysical Journal; Journal Volume: 628; Journal Issue: 2

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  • Report No.: UCRL-JRNL-211629
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 875359
  • Archival Resource Key: ark:/67531/metadc877146

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  • April 12, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 9, 2016, 9 p.m.

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Hoogerwerf, R; Brickhouse, N S & Mauche, C W. X-ray Light Curves and Accretion Disk Structure of EX Hydrae, article, April 12, 2005; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc877146/: accessed November 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.