Molecules in planetary nebulae

Details Molecules in planetary nebulae Molecules in planetary nebulae

May 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...222..125b&link_type=abstract

Astrophysical Journal, Part 1, vol. 222, May 15, 1978, p. 125-131.

Astronomy and Astrophysics

Astronomy

65

Abundance, Infrared Astronomy, Molecular Ions, Planetary Nebulae, Chemical Reactions, Hydrogen Ions, Hydroxyl Emission, Line Spectra, Reaction Kinetics

Scientific paper

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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