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Title: Temperature Measurements Using the Dielectronic Satellite Lines of Fe xvii

Abstract

The coronal temperature of Capella and Procyon has been derived from the spectral emission of Fe XVII observed in high resolution with Chandra's High Energy Transmission Grating Spectrometer. The measurement makes use of well resolved dielectronic satellite features with a spectator electron in the n = 4 shell. This method does not require a priori knowledge of the ionization equilibrium or of the elemental abundances. We find the temperature of Fe XVII emission is $${264}_{-51}^{+142}$$ eV for Procyon and $${514}_{-25}^{+27}$$ eV for Capella, i.e., 3.1 and 6.0 MK, respectively. As a result, the Procyon measurement is based on three X-rays observed in the dielectronic satellite feature, which illustrates the power of the method even for low-signal observations.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [3]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of California, Berkeley, CA (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Univ. of California, Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1583038
Report Number(s):
LLNL-JRNL-742702
Journal ID: ISSN 1538-4357; 897558
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 864; Journal Issue: 1; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; atomic processes; line: formation; stars: coronae; stars: individual (Procyon, Capella); X-rays: general

Citation Formats

Beiersdorfer, P., Hell, N., and Lepson, J. K. Temperature Measurements Using the Dielectronic Satellite Lines of Fe xvii. United States: N. p., 2018. Web. doi:10.3847/1538-4357/aad27f.
Beiersdorfer, P., Hell, N., & Lepson, J. K. Temperature Measurements Using the Dielectronic Satellite Lines of Fe xvii. United States. doi:10.3847/1538-4357/aad27f.
Beiersdorfer, P., Hell, N., and Lepson, J. K. Mon . "Temperature Measurements Using the Dielectronic Satellite Lines of Fe xvii". United States. doi:10.3847/1538-4357/aad27f. https://www.osti.gov/servlets/purl/1583038.
@article{osti_1583038,
title = {Temperature Measurements Using the Dielectronic Satellite Lines of Fe xvii},
author = {Beiersdorfer, P. and Hell, N. and Lepson, J. K.},
abstractNote = {The coronal temperature of Capella and Procyon has been derived from the spectral emission of Fe XVII observed in high resolution with Chandra's High Energy Transmission Grating Spectrometer. The measurement makes use of well resolved dielectronic satellite features with a spectator electron in the n = 4 shell. This method does not require a priori knowledge of the ionization equilibrium or of the elemental abundances. We find the temperature of Fe XVII emission is ${264}_{-51}^{+142}$ eV for Procyon and ${514}_{-25}^{+27}$ eV for Capella, i.e., 3.1 and 6.0 MK, respectively. As a result, the Procyon measurement is based on three X-rays observed in the dielectronic satellite feature, which illustrates the power of the method even for low-signal observations.},
doi = {10.3847/1538-4357/aad27f},
journal = {The Astrophysical Journal (Online)},
number = 1,
volume = 864,
place = {United States},
year = {2018},
month = {8}
}

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