Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.1702d&link_type=abstract
American Astronomical Society, HEAD meeting #11, #17.02; Bulletin of the American Astronomical Society, Vol. 41, p.682
Astronomy and Astrophysics
Astronomy
Scientific paper
We use new EBIT measurements of Si V-XII, S VI-XIII, Mg VI-XI, and Fe XI-XVI along with recent Flexible Atomic Code (FAC) calculations to identify and benchmark the emission lines from these ions in the 40-120 Angstrom region of Capella and Procyon. This region corresponds to the soft x-ray part of the LETG spectrum, which has a lot of weak unidentified lines, thus greatly reducing the usability of the LETG. Line blending and weak lines contribute to a pseudo-continuum making it hard to use any of the lines in this region as a reliable diagnostic.
High quality spectral grating observations of Capella taken by Chandra and Procyon for calibration purposes have provided us with a unique opportunity to improve the inaccuracies and incompleteness of the atomic data in existing spectral codes.
This work was supported by NASA through Chandra Award AR7-8801X. Work at LLNL was performed under the auspices of DOE under contract DE-AC53-07NA27344.
Beiersdorfer Peter
Brickhouse Nancy
Desai Priya
Gu Min Feng
Lepson Jaan
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