Laboratory measurements of the relative intensity of the 3s→2p and 3d→2p transitions in Fe XVII

被引:73
作者
Beiersdorfer, P
Behar, E
Boyce, KR
Brown, GV
Chen, H
Gendreau, KC
Gu, MF
Gygax, J
Kahn, SM
Kelley, RL
Porter, FS
Stahle, CK
Szymkowiak, AE
机构
[1] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA
[2] Columbia Univ, Columbia Astrophys Lab, New York, NY 10027 USA
[3] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20770 USA
[4] MIT, Ctr Space Res, Cambridge, MA 02139 USA
基金
美国国家航空航天局;
关键词
atomic data; stars : coronae; stars; individual; (Capella; Procyon); Sun; X-rays; gamma rays; X-rays : general;
D O I
10.1086/343785
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The intensity ratios of the 3s-->2p and 3d-->2p lines in Fe XVII were measured on the Livermore electron beam ion trap employing a complementary set of spectrometers, including a high-resolution crystal spectrometer and the Goddard 32 pixel calorimeter. The resulting laboratory data are in agreement with satellite measurements of the Sun and astrophysical sources in collisional equilibrium such as Capella, Procyon, and NGC 4636. The results disagree with earlier laboratory measurements and assertions that processes not accounted for in laboratory measurements must play a role in the formation of the Fe XVII spectra in solar and astrophysical plasmas.
引用
收藏
页码:L169 / L172
页数:4
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