Temperature Measurements Using the Dielectronic Satellite Lines of Fe xvii

Beiersdorfer, P.; Hell, N.; Lepson, J. K.

doi:10.3847/1538-4357/aad27f

Temperature Measurements Using the Dielectronic Satellite Lines of Fe xvii

Journal Article · Mon Aug 27 00:00:00 EDT 2018 · The Astrophysical Journal (Online)

DOI:https://doi.org/10.3847/1538-4357/aad27f· OSTI ID:1583038

^[1]; ^[2]; Lepson, J. K. ^[3]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of California, Berkeley, CA (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of California, Berkeley, CA (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1583038

Report Number(s):: LLNL-JRNL--742702; 897558

Journal Information:: The Astrophysical Journal (Online), Journal Name: The Astrophysical Journal (Online) Journal Issue: 1 Vol. 864; ISSN 1538-4357

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Highly charged ions in a new era of high resolution X‐ray astrophysics Hell, Natalie; Beiersdorfer, Peter; Brown, Gregory V. X-Ray Spectrometry, Vol. 49, Issue 1 https://doi.org/10.1002/xrs.3107	journal	April 2019
Polarization measurements of Ne-like Mo ³²⁺ x-ray lines excited by an electron beam Petkov, E. E.; Safronova, A. S.; Kantsyrev, V. L. Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 52, Issue 19 https://doi.org/10.1088/1361-6455/ab38e6	journal	September 2019
High Resolution Photoexcitation Measurements Exacerbate the Long-Standing Fe XVII Oscillator Strength Problem Kühn, Steffen; Shah, Chintan; López-Urrutia, José R. Crespo Physical Review Letters, Vol. 124, Issue 22 https://doi.org/10.1103/physrevlett.124.225001	journal	June 2020
High Resolution Photoexcitation Measurements Exacerbate the Long-Standing Fe XVII Oscillator Strength Problem Kühn, Steffen; Shah, Chintan; López-Urrutia, José R. Crespo GSI Helmholtzzentrum fuer Schwerionenforschung, GSI, Darmstadt https://doi.org/10.15120/gsi-2020-00897	text	January 2020
Revisiting the Fe xvii Line Emission Problem: Laboratory Measurements of the 3 s –2 p and 3 d –2 p Line-formation Channels Shah, Chintan; López-Urrutia, José R. Crespo; Gu, Ming Feng The Astrophysical Journal, Vol. 881, Issue 2 https://doi.org/10.3847/1538-4357/ab2896	journal	August 2019
Revisiting the Fe XVII line emission problem: laboratory measurements of the 3s-2p and 3d-2p line-formation channels Shah, Chintan; López-Urrutia, José R. Crespo; Gu, Ming Feng arXiv https://doi.org/10.48550/arxiv.1903.04506	text	January 2019

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