Publication Date:
2019-01-25
Description:
Analysis of the published IUE and ground based high resolution spectra of symbiotic stars, particularly RR Tel, shows that the dominant excitation mechanism of Fe II, Mn II, Ti II, and N I lines is the selective fluorescent excitation of some levels by the strong C IV, N V, and O VI emission lines. The same mechanism should work for the excitation of Fe II lines in the spectra of Seyfert galaxies and Q60's whose emission spectra are quite similar to those of symbiotic stars. The similarities and differences between the fluroescent excitation mechanism reported herein and the Bowen's mechanism is analyzed.
Keywords:
ASTRONOMY
Type:
NASA. Goddard Space Flight Center Future of Ultraviolet Astronomy Based on Six Years of IUE Res.; p 147
Format:
text
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