Oscillator strengths for transitions in N I and the interstellar abundance of nitrogen

Astronomy and Astrophysics – Astronomy

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Abundance, Interstellar Matter, Nitrogen, Optical Transition, Oscillator Strengths, Configuration Interaction, Forbidden Transitions, Interstellar Extinction, Oao 3, Transition Probabilities, Wave Functions

Scientific paper

Oscillator strengths based on configuration interaction wavefunctions are presented for both optically allowed and forbidden transitions in N I. Particular attention is given to the multiplets at 951 Å (2p3 4S-2p23d2D), 952 Å (2p3 4S-2p23d4D) and 1160 Å (2p3 4S-2p23s2P) which have been extensively observed by the COPERNICUS satellite. For these transitions, the radiative rates are estimated to have an accuracy of 20 per cent or better. A re-analysis of the COPERNICUS observational data indicates there is no depletion of nitrogen towards reddened stars. Possible causes of a small depletion (≅0.2 dex) towards several nearby unreddened stars are discussed.

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