Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...482.1076d&link_type=abstract
Astrophysical Journal v.482, p.1076
Astronomy and Astrophysics
Astronomy
33
Atomic Data, Atomic Processes, Methods: Laboratory, Plasmas
Scientific paper
We present laboratory measurements of high-resolution spectra of iron K alpha emission under transient ionization conditions similar to those that are believed to exist in stellar flares and young supernova remnants. Taking advantage of our high spectral resolution ( lambda / Delta lambda >= 2000), we identify a number of transitions that can serve as diagnostics of ionizing plasmas. By varying the excitation energy in the experiments, we constrain the effects of the electron distribution on these diagnostic lines. Using our measured line ratios, we deduce values for the ionization time, eta = Net, in the plasma, which agree with the actual values to ~20% accuracy. This result gives us confidence to our ability to derive similar constraints on astrophysical plasmas from remote X-ray spectroscopic observations.
Beiersdorfer Peter
Decaux V.
Jacobs Verne L.
Kahn Steve M.
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