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Title: Density Determinations of the Coronae of Cool Stars Using a Newly Assigned Pair of Fe Xiv Lines in the Spectra of α Canis Minor, α Centauri, and the Sun [Density determinations of the coronae of cool stars using a newly assigned pair of Fe XIV lines in the spectra of alpha Canis Minor, alpha Centauri, and the Sun.]

We identified a previously unassigned pair of lines between 169 and 170 Å in the coronae of cool stars. Here, we attribute these lines to Fe xiv and show that their intensity ratio is sensitive to the electron density. Using observations taken with the Low Energy Transmission Grating Spectrometer of the Chandra X-ray Observatory we infer a density of log (n e/cm -3) = 10.2 ± 0.7 and 10.3 ± 0.8 from the newly identified line pair in the coronae of Procyon and α Cen A, respectively.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [4]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Physics Division; Univ. of California, Berkeley, CA (United States). Space Sciences Lab.
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Physics Division; Univ. of Erlangen-Nuremberg, Erlangen (Germany)
  3. Univ. of California, Berkeley, CA (United States). Space Sciences Lab.
  4. Univ. of Puerto Rico, San Juan, PR (United States). Dept. of Chemistry and the Chemical Physics Program
Publication Date:
Report Number(s):
LLNL-JRNL-676952
Journal ID: ISSN 1538-4357; TRN: US1703097
Grant/Contract Number:
AC52-07NA27344; 4000114313115/NL/CB
Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 815; Journal Issue: 1; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE; European Space Agency
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; 79 ASTRONOMY AND ASTROPHYSICS; atomic processes; line formation; stars coronae; stars individual (Procyon, Alpha Centauri); Sun: X-rays; gamma-rays
OSTI Identifier:
1400091