Emission of HeH(+) in nebulae

Details Emission of HeH(+) in nebulae Emission of HeH(+) in nebulae

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...413..611c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 413, no. 2, p. 611-618.

Astronomy and Astrophysics

Astrophysics

23

Emission Spectra, Interstellar Chemistry, Molecular Ions, Planetary Nebulae, Astronomical Models, Helium, Ionization

Scientific paper

The formation and destruction processes of HeH(+) in nebulae are discussed, and calculations of the abundances of HeH(+) are presented. It is shown that for effective temperatures of the ionizing source exceeding 50,000 K, the abundances are of the order of 10 exp 12/sq cm, largely independent of the nebular parameters. The emission-line intensities increase approximately as the density of the nebula. Results are given for two detailed models of the planetary nebula NGC 7027. The predicted intensities exceed the observational upper limit. The emissions have sharply peaked distributions with maximum intensity reached in a narrow zone at the edge of the ionized region. The greater part of the emission may be outside the region observed.

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