[O v] in the Ultraviolet Spectra of Gaseous Nebulae

Astronomy and Astrophysics – Astronomy

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Atomic Data, Atomic Processes, Stars: Binaries: Symbiotic, Stars: Individual Constellation Name: Rr Telescopii, Ultraviolet: Stars

Scientific paper

Theoretical O V electron-density--sensitive emission line ratios for R = I(2s2 1S0 - 2s2p 3P2)/I(2s2 1S0 - 2s2p 3P1) are presented. Inspection of Goddard High Resolution Spectrograph Hubble Space Telescope spectra of RR Tel reveals the presence of the [O V] 2s2 1S - 2s2p 3P2 line at 1213.80 Angstroms, which is 4.62 +/- 0.12 Angstroms away from the 2s2 1S - 2s2p 3P2 intercombination transition at 1218.42 Angstroms, in good agreement with the theoretical prediction of Delta lambda = 4.54 Angstroms. The resultant value of R = 0.82 +/- 0.11 implies a logarithmic electron density, log Ne, of 5.2 +/- 0.2 cm-3, in good agreement with that found from other ions with high electron temperature, such as Ne VI, which also provides support for the identification.

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