Detection of the hydrocarbon ring molecule C3H2 in the planetary nebula NGC 7027

Details Detection of the hydrocarbon ring molecule C3H2 in the planetary nebula NGC 7027 Detection of the hydrocarbon ring molecule C3H2 in the planetary nebula NGC 7027

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...181l..19c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 181, no. 2, July 1987, p. L19-L22.

Astronomy and Astrophysics

Astrophysics

28

Cosmochemistry, Cyclic Hydrocarbons, Interstellar Matter, Planetary Nebulae, Compressed Gas, Hydrogen Clouds, Interstellar Masers, Molecular Spectra, Ortho Para Conversion, Statistical Analysis

Scientific paper

The ortho and para transitions of the C3H2 hydrocarbon ring molecule have been detected in the planetary nebula NGC 7027, and are presently analyzed by means of statistical equilibrium calculations which allow constraints to be placed on the physical conditions of the nebula's molecular envelope. The analysis shows that the emission must originate in the dense molecular environment just outside the H II region, which probably represents the cooled, compressed gas layer preceding the expanding ionization front. The C3H2 abundance derived from the data is comparable to that measured in dark clouds.

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