Wavelengths of the [NII] ^3P-^1D forbidden lines

Astronomy and Astrophysics – Astronomy

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Line: Profiles, Planetary Nebulae: Individual: Ic 2501, Planetary Nebulae: Individual: He 2-182, Planetary Nebulae: Individual: He 2-138

Scientific paper

The wavelengths of the ^3P-^1D transitions of [NII] have been determined by observing planetary nebulae with the Ultra-High-Resolution Facility at the Anglo-Australian Telescope. The accuracy achieved is a factor of 5 better than for previous determinations. The combination of a large collecting area and the most efficient very high-resolution spectrograph available to the community has made this experiment possible. The new air wavelengths for the ^3P_1-^1D_2 and ^3P_2-^1D_2 lines are 6583.454+/-0.007 and 6548.08+/-0.01A respectively.

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