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X-Ray Emission Line Spectroscopy of Cataclysmic Variables. II. Temperatures and Densities from Line Ratios in the Chandra HETG Band

Schlegel, E. M. and Shipley, H. V. and Rana, V. R. and Barrett, P. E. and Singh, K. P. (2014) X-Ray Emission Line Spectroscopy of Cataclysmic Variables. II. Temperatures and Densities from Line Ratios in the Chandra HETG Band. Astrophysical Journal, 797 (1). Art. No. 38. ISSN 0004-637X. https://resolver.caltech.edu/CaltechAUTHORS:20150105-092723340

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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 10^(12) to >10^(16) 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
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1088/0004-637X/797/1/38DOIArticle
http://iopscience.iop.org/0004-637X/797/1/38PublisherArticle
ORCID:
AuthorORCID
Rana, V. R.0000-0003-1703-8796
Additional Information:© 2014 American Astronomical Society. Received 2012 May 29; accepted 2013 March 26; published 2014 November 24. We thank the referee for comments that improved the quality of this paper. E.M.S. acknowledges support from the Chandra X-ray Center through archival grant AR9-0005X to UTSA and partial support from the Vaughan Family endowment.
Funders:
Funding AgencyGrant Number
NASAAR9-0005X
Vaughan Family endowmentUNSPECIFIED
Subject Keywords:novae, cataclysmic variables; stars: dwarf novae; X-rays: binaries
Issue or Number:1
Record Number:CaltechAUTHORS:20150105-092723340
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150105-092723340
Official Citation:X-Ray Emission Line Spectroscopy of Cataclysmic Variables. II. Temperatures and Densities from Line Ratios in the Chandra HETG Band E. M. Schlegel et al. 2014 ApJ 797 38
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:53165
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:05 Jan 2015 17:47
Last Modified:03 Oct 2019 07:47

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