Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976mmsai..47..313f&link_type=abstract
Società Astronomica Italiana, Memorie, vol. 47, Sept. 1976, p. 313-335.
Astronomy and Astrophysics
Astronomy
2
Emission Spectra, Line Spectra, Planetary Nebulae, Ultraviolet Spectra, Atmospheric Ionization, Atomic Excitations, Fluorescence, Metals, Particle Collisions, Radiant Flux Density, Recombination Reactions, Ultraviolet Absorption, Ultraviolet Photometry
Scientific paper
The prediction of the ultraviolet emission line spectra of planetary nebulae is discussed, with attention given to the possible excitation mechanisms as well as to problems involved in calculating the ionization and thermal structure of high-excitation nebulae. The production of emission lines of elements heavier than helium, due to such processes as electron collisional excitation followed by spontaneous radiative decay, excitation via recombination and cascade, excitation via resonant absorption of stellar ultraviolet continuum radiation, and the Bowen fluorescent mechanism, is considered. A model of the ionization and thermal structure of the nebulae, based on the Planck function, is used to compute ultraviolet line intensities for sample cases. Ultraviolet photometric observations of planetary nebulae are also mentioned.
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