Forbidden and intercombination lines of RR Telescopii: wavelength measurements and energy levels

Abstract

Ultraviolet and visible spectra of the symbiotic nova RR Telescopii are used to derive reference wavelengths for many forbidden and intercombination transitions of ions +1 to +6 of elements C, N, O, Ne, Na, Mg, Al, Si, P, S, Cl, Ar, K and Ca. The wavelengths are then used to determine new energy values for the levels within the ions' ground configurations or first excited configuration. The spectra were measured by the Space Telescope Imaging Spectrograph of the Hubble Space Telescope and the UltraViolet Echelle Spectrograph of the European Southern Observatory in 2000 and 1999, respectively, and cover 1140 to 6915 A. Particular care was taken to assess the accuracy of the wavelength scale between the two instruments. An investigation of the profiles of the emission lines reveals that the nebula consists of at least two plasma components at different velocities. The components have different densities, and a simple model of the lines' emissions demonstrates that most of the lines principally arise from the high density component. Only these lines were used for the wavelength study.

54 pages, 4 figures, submitted to ApJ

References in corpus (5)

• On the effect of emission lines on the UBVR photometry
• The He II Fowler lines and the O III and N III Bowen fluorescence lines in the symbiotic nova RR Tel
• Fe VII lines in the spectrum of RR Telescopii
• The effect of dust obscuration in RR Tel on optical and IR long-term photometry and Fe II emission lines
• Variation of fluxes of RR Tel emission lines measured in 2000 with respect to 1996

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