Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...327l..85j&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 327, April 15, 1988, p. L85-L88.
Astronomy and Astrophysics
Astrophysics
22
Fluorescence, Line Spectra, Nuclear Reactions, Ultraviolet Spectra, Wave Excitation, Iue, Lyman Alpha Radiation, Mass Transfer, Symbiotic Stars
Scientific paper
A new, highly excited level of Fe II at 13.7 eV has been established by means of six lines in the laboratory spectrum below 2000 Å. Confirming transitions appear in the infrared region. Four of the ultraviolet lines coincide with previously unidentified lines in the IUE spectrum of RR Tel reported by Penston et al. (1983). One of the remaining UV lines coincides with the resonance line of O VI at 1032 Å, outside the range of the IUE. This suggests that the new Fe II level is selectively photoexcited by O VI in RR Tel, resulting in strong fluorescence lines observed. This case of a Bowen mechanism provides an indirect observation of O VI, important for diagnostics of, e.g., symbiotic stars.
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