On the diatomic and triatomic hydrogen molecules in the planetary nebula NGC 7027

Details On the diatomic and triatomic hydrogen molecules in the planetary nebula NGC 7027 On the diatomic and triatomic hydrogen molecules in the planetary nebula NGC 7027

Apr 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jrasc..82...69g&link_type=abstract

Journal of the Royal Astronomical Society of Canada (ISSN 0035-872X), vol. 82, April 1988, p. 69-78.

Astronomy and Astrophysics

Astronomy

4

Cosmic Gases, Diatomic Molecules, Hydrogen, Planetary Nebulae, Triatomic Molecules, Gas Ionization, Molecular Excitation, Particle Size Distribution, Spectral Emission, Spectral Signatures

Scientific paper

Excitation mechanisms for the long-observed H2 emission of NGC 7027 are reviewed in this paper. It is found that the observed emission could be produced by shock excitation of an inhomogeneous molecular envelope. Interstellar formation processes of the exotic forms of molecular hydrogen H2(+), H3(+), and H3 are also discussed. It is found that the molecular ion H2(+) is produced readily by the ionization of H2. However, this ion is not easily observable since it lacks a readily distinguishable spectral signature at optical wavelengths. An abundance of the species H3(+) may also be produced in the molecular envelope, has a readily recognizable IR spectrum, and should be searched for in the future. The molecule H3 is not expected to be present in significant concentrations. A report of an unsuccessful spectrophotometric search for this molecule is presented.

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