New Identifications of Extreme Ultraviolet Emission Lines of Highly Charged Iron in Procyon

Details New Identifications of Extreme Ultraviolet Emission Lines of Highly Charged Iron in Procyon New Identifications of Extreme Ultraviolet Emission Lines of Highly Charged Iron in Procyon

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011head...12.1003l&link_type=abstract

American Astronomical Society, HEAD meeting #12, #10.03

Astronomy and Astrophysics

Astronomy

Scientific paper

Spectra of Procyon taken with the Chandra X-ray Observatory's Low Energy Transmission Grating Spectrometer show a wealth of unidentified lines in the extreme ultraviolet spectral region, especially in co-added spectra that increase the signal to noise for weaker lines. Many of these unidentified lines are thought to be due to iron emission. We used the Lawrence Livermore electron beam ion trap facility to make high-resolution measurements of highly charged iron (Fe VII- XVI) in the EUV spectral region 40-140 Å. By combining our measurements with new calculations made with the Flexible Atomic Code at electron densities appropriate for Procyon, we created wavelength-corrected spectra directly applicable to Procyon. We compare our corrected spectra with a co-added spectrum that incorporates the recent 140 ksec observation from the Chandra LETGS and present new identifications of iron emission lines.
Work by Lawrence Livermore National Laboratory was performed under the auspices of the U. S. Department of Energy under Contract DE-AC52-07NA-27344. This work was supported by Chandra Research Award GO0-11031X.

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