Theoretical emission line ratios for Fe III and Fe VII applicable tothe optical and infrared spectra of gaseous nebulae

Keenan FP; Aller LH; Ryans RSIHyung S

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Theoretical emission line ratios for Fe III and Fe VII applicable tothe optical and infrared spectra of gaseous nebulae

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Recent calculations of electron impact excitation rates and Einstein A-coefficients for transitions among the 3d(6) levels of Fe III and among the 3d(2) levels of Fe VII are used to derive theoretical emission line ratios applicable to the optical and infrared spectra of gaseous nebulae. Results for Fe III are generated for electron temperatures T-e = 7,000-20,000 K and densities N-e = 10(2)-10(8) cm(-3), whereas those for Fe VII are provided for T-e = 10,000-30,000 K and N-e = 10(2)-10(8) cm(-3). The theoretical line ratios are significantly different in some instances from earlier calculations and resolve discrepancies between theory and observation found for the planetary nebulae IC 4997 and NGC 7027.

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《Proceedings of the National Academy of Sciences of the United States of America》 |2001年第17期|9476-9477|共2页
作者
Keenan FP; Aller LH; Ryans RSIHyung S;
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作者单位

Keenan FP, Queens Univ Belfast, Dept Pure & Appl Phys, Belfast BT7 1NN, Antrim, North Ireland;

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收录信息美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类自然科学总论;
关键词
Electron-impact excitation; Iron project; Atomic data; Transition-probabilities; Astrophysical plasmas; Orion nebula; Strengths; Spectrophotometry; Populations;

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机译：Theoretical studies of the optical and EPR spectra for Fe3+ ion in the MF3:Fe3+ (M = Al, Ga) systems
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5. Theoretical emission line ratios for Fe III and Fe VII applicable to the optical and infrared spectra of gaseous nebulae [O] . Francis P. Keenan, Lawrence H. Aller, Robert S. I. Ryans, 2001

机译：Fe III和Fe VII的理论发射谱线比率适用于气态星云的光谱和红外光谱
6. Theoretical emission line ratios for [Fe III] and [Fe VII] applicable to the optical and infrared spectra of gaseous nebulae [O] . Keenan, Francis P., Aller, Lawrence H., Ryans, Robert S. I., 2001

机译：[Fe III]和[Fe VII]的理论发射谱线比率适用于气态星云的光谱和红外光谱

Theoretical emission line ratios for Fe III and Fe VII applicable tothe optical and infrared spectra of gaseous nebulae

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