Abstract
The possiblity of the excitation of a new class of spectral lines, so calledpseudo-resonance absorption lines in the conditions of planetary nebulae, is predicted. These lines are formed by permitted atomic transitions from the metastable levels to the upper subordinate, but not metastable, levels. To observe pseudo-resonance lines of ‘nebular’ origin is possible only on the spectra of the nuclei of planetary and diffuse nebulae in the form of absorption lines.
The preliminary list of pseudo-resonance lines is given in Table I; all of them are located in the region of vacuum ultra-violet (1000–3000 Å), therefore, their observation is possible only under space conditions.
In stellar photospheres as well as in the interstellar medium the formation of pseudo-resonance lines is impossible.
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References
Grewing, A., Seaton, M. J. et al.: 1978,Nature 275, 24.
Gurzadyan, G. A.: 1979,Astrofizika 15, 461.
Gurzadyan, G. A.: 1975,Monthly Notices Roy. Astron. Soc. 172, 249.
Harrington, J. P., Lutz, J. H., Seaton, M. J., and Stickland, D. J.: 1980,Monthly Notices Roy. Astron. Soc., in press.
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Gurzadyan, G.A. On the pseudo-resonance absorption lines in planetary nebulae. Astrophys Space Sci 80, 189–195 (1981). https://doi.org/10.1007/BF00649146
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DOI: https://doi.org/10.1007/BF00649146