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Title:
Molecules in planetary nebulae
Authors:
Black, J. H.
Affiliation:
AA(Minnesota, University, Minneapolis, Minn.)
Publication:
Astrophysical Journal, Part 1, vol. 222, May 15, 1978, p. 125-131. (ApJ Homepage)
Publication Date:
05/1978
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Abundance, Infrared Astronomy, Molecular Ions, Planetary Nebulae, Chemical Reactions, Hydrogen Ions, Hydroxyl Emission, Line Spectra, Reaction Kinetics
DOI:
10.1086/156128
Bibliographic Code:
1978ApJ...222..125B

Abstract

It is shown that significant abundances of simple molecules, like H2, H2(+), HeH(+), OH, and CH(+), can exist in the transition zones of ionized nebulas. The dominant molecular processes in such regions, where neutral atoms and free electrons mingle at moderately high temperatures, are discussed. Equilibrium abundances of molecules are computed for a model transition zone. It is possible that the observed rotation-vibration lines of H2 in NGC 7027 arise in such a region. Both HeH(+) and OH will exist in sufficient amounts to radiate detectable lines near 3 microns; the source of unidentified lines at 3.28 and 3.4 microns in NGC 7027 is thus not yet clearly established by low-resolution spectra.

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