Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...281..644h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 281, June 15, 1984, p. 644-649. Research supported by the A. J. Cannon Fund
Astronomy and Astrophysics
Astrophysics
18
Abundance, Crab Nebula, Forbidden Transitions, Infrared Spectra, Nickel, Orion Nebula, Supernova Remnants, Filaments, Iron, Nuclear Fusion
Scientific paper
The published line strengths of Ni II 7378 and Fe II 8617 are used at 12 positions in the Crab nebula in order to determine the Ni/Fe abundance ratio at each location. The Ni/Fe ratio is found to exceed the solar value by one order of magnitude in each location. An analysis of the data for one position in the Orion nebula showed similar results. Explanations for the data are discussed, specifically the possibility that both objects contain material which has been processed nucleosynthetically under neutron-rich conditions; that Fe is preferentially depleted through grain formation in both objects; that large errors exist in the atomic data; and that certain physical processes such as charge exchange or dielectronic or radiative recombination affect the ionization balance or the populations of the upper levels of the relevant transitions in a manner not accounted for in the analysis.
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