Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprb17114b&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
Scientific paper
The relative intensity, R, of the resonance and intercombination line in neon-like Fe uc(xvii,) located at 15.01 and 15.26 Årespectively, has been measured at the Lawrence Livermore National Laboratory (LLNL) electron beam ion trap uc(ebit-ii) as a function of the relative abundance of sodium-like Fe uc(xvi.) We show that an Fe uc(xvi) innershell satellite line coincides with the intercombination line and can significantly reduce the apparent R. We measure R = 1.90 ± 0.11 when the relative abundance of Fe uc(xvi) to Fe uc(xvii) is ~ 1. This explains the anomalously low ratios observed in the solar and stellar coronae previously believed to be the result of resonant scattering. The fact that the apparent relative intensity of the resonance and intercombination line in Fe uc(xvii) is sensitive to the strength of an Fe uc(xvi) innershell satellite, and therefore, the relative abundance of Fe uc(xvi) to Fe uc(xvii,) makes the line ratio a diagnostic of temperature. Work by the University of California, LLNL was performed under Contract No. W-7405-Eng-48 and supported by NASA SARA P.O. No. S-03958G and Smithsonian-CXO award No. EL9-1015A.
Beiersdorfer Peter
Brown Gregory V.
Chen Haibin
Chen Ming-Hui
Reed Kevin
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