Identification of Fe XVI L-Shell Transitions in the Spectra of Capella Using Laboratory Measurements and Novel Energy Level Calculations

Details Identification of Fe XVI L-Shell Transitions in the Spectra of Capella Using Laboratory Measurements and Novel Energy Level Calculations Identification of Fe XVI L-Shell Transitions in the Spectra of Capella Using Laboratory Measurements and Novel Energy Level Calculations

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011head...12.1001b&link_type=abstract

American Astronomical Society, HEAD meeting #12, #10.01

Astronomy and Astrophysics

Astronomy

Scientific paper

Identifications of Fe XVI lines between 15 and 17 [[Unable to Display Character: Ǻ]] are made in the spectra of Capella observed with the MEG and HEG instruments of the Chandra X-ray Observatory. The identifications are based on laboratory measurements, modeling calculations, and very accurate line position calculations. A total of nine heretofore unfitted features in the Capella spectra are shown to be associated with Fe XVI lines. In addition, we confirm that one (strong) Fe XVI blends with an Fe XVII at 15.26 [[Unable to Display Character: Ǻ]], and another (but weak) Fe XVI line blends with an Fe XVIII line at 17.62 [[Unable to Display Character: Ǻ]]. We predict the wavelength of the Fe XVI line that blends with the Fe XVII line to be 15.266 [[Unable to Display Character: Ǻ]]. Its wavelength is within 0.0042 [[Unable to Display Character: Ǻ]] of the strong Fe XVII line commonly labeled 3D. A spectral power of better than 3600 is, therefore, needed to resolve this blend, which is much higher than current spectrometers can achieve.
Work by the Lawrence Livermore National Laboratory was performed under the auspices of the Department of Energy under Contract No. DE-AC52-07NA-27344. This work was supported by NASA Astronomy and Physics Research and Analysis contract NNG07WF05I and Chandra Research Award AR1-12006X.

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