Charge transfer reactions - A consistent model of the planetary nebula NGC 7027

Details Charge transfer reactions - A consistent model of the planetary nebula NGC 7027 Charge transfer reactions - A consistent model of the planetary nebula NGC 7027

Feb 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....63..313p&link_type=abstract

Astronomy and Astrophysics, vol. 63, no. 3, Feb. 1978, p. 313-324.

Astronomy and Astrophysics

Astrophysics

121

Astronomical Models, Charge Transfer, Hydrogen Clouds, Planetary Nebulae, Abundance, Carbon, Neon, Oxygen Ions, Sulfur

Scientific paper

This paper reports the failure of numerical tests of analytical models for the planetary nebula NGC 7027 which assume the ionization and temperature structure of a steady-state spherically symmetric nebula photoionized by a central source. It is proposed that the observations of NGC 7027 be interpreted in terms of charge-transfer reactions with atomic hydrogen. The charge-transfer rates giving the best fit to the observations are deduced, and the residual discrepancies are discussed in the framework of a two-component model. Some observational tests of the charge-transfer model are suggested. It is concluded that large density fluctuations are not required to explain the emission-line spectrum.

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