Diagnostic utility of the relative intensity of 3C to 3D in Fe XVII

被引：86

作者：

Brown, GV ^{[1
]}

Beiersdorfer, P ^{[1
]}

Chen, H ^{[1
]}

Chen, MH ^{[1
]}

Reed, KJ ^{[1
]}

机构：

[1] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA

来源：

ASTROPHYSICAL JOURNAL | 2001年 / 557卷 / 01期

关键词：

atomic data; line : identification; stars : coronae; Sun : Corona; Sun; X-rays; gamma rays; X-rays : general;

D O I：

10.1086/323004

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The relative intensity R of the resonance and intercombination line in neon-like Fe XVII, located at 15.01 and 15.26 Angstrom, respectively, has been measured at the Lawrence Livermore National Laboratory electron beam ion trap EBIT-II as a function of the relative abundance of sodium-like Fe XVI. Our measurements identify several Fe xvi lines and one Fe XV line in this region. We show that an Fe xvi inner shell 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 XVI to Fe XVII is similar to1. This explains the anomalously low ratios observed in the solar and stellar coronae. The fact that the apparent relative intensity of the resonance and intercombination line in Fe XVII is sensitive to the strength of an Fe XVI inner shell satellite, and therefore, the relative abundance of Fe XVI to Fe XVII, makes the line ratio a diagnostic of temperature.

引用

页码：L75 / L78

页数：4

共 36 条

[11] Wide-band, high-resolution soft x-ray spectrometer for the Electron Beam Ion Trap [J].