/Ni II/ emission under nebular conditions

Details /Ni II/ emission under nebular conditions /Ni II/ emission under nebular conditions

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...110..295n&link_type=abstract

Astronomy and Astrophysics, vol. 110, no. 2, June 1982, p. 295-299.

Astronomy and Astrophysics

Astrophysics

49

Collision Parameters, Emission Spectra, Forbidden Bands, Nebulae, Nickel, Spectral Energy Distribution, Transition Probabilities, Atomic Energy Levels, B Stars, Crab Nebula, Electron Density (Concentration), Electron Energy, Orion Nebula, Positive Ions, Stellar Envelopes

Scientific paper

Calculations are made of the transition probabilities and collision strengths for the energetically lowest 17 levels of Ni(+). The determination of electron density and temperature on the basis of the intensity ratios of visual forbidden Ni II lines is discussed. It is shown that doubts about the assignment to the forbidden Ni II of a strong spectral feature observed in the Crab nebula at 7378 A are without foundation. The atomic data presented here permit an interpretation of the absolute intensities of the observed forbidden Ni II spectrum. It is shown that the intensity ratio of the two lines at 7377.8 A and 7411.6 A of the same multiplet strongly depends on the electron temperature and electron density of the emitting region.

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