The Formation of Optical CNO Emission Lines in Cataclysmic Variables
The Formation of Optical CNO Emission Lines in Cataclysmic Variables
复制标题
灾难变星中光学 CNO 发射线的形成
DOI：
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发表时间：
1983
期刊：
影响因子：
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通讯作者：
D. Ferguson
中科院分区：
文献类型：
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作者：
Robert E. Williams;D. Ferguson
本文介绍了旧新星系统CNO发射谱线的光谱观测结果，并讨论了这些谱线可能的激发过程。由于N - III - λ3429的弱，通常不能用玻温荧光机制来解释N - III - λ4640的强度。观察到的其他CNO谱线表明，所有谱线都是由紫外连续辐射的共振荧光激发的。一些非荧光的碳激发线也存在于老新星中，可能是由重组过程形成的。光学CNO谱线的现有数据表明，静止新星中存在非太阳CNO增强，这表明一些双星系统可能已经演化。
Spectroscopic observations of CNO emission lines are presented for old nova systems, and possible excitation processes for the lines are considered. The Bowen fluorescence mechanism cannot generally be responsible for the strength of N III λ4640 because of the weakness of 0 III λ3429. Other CNO lines are observed which indicate that all of the lines are excited by resonance fluorescence of UV continuum radiation. Several nonfluorescent excited lines of carbon are also present in old novae, probably formed by recombination processes. The available data for the optical CNO lines suggest that non-solar CNO enhancements exist in quiescent novae, indicating that some of the binary systems may be evolved.