Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...201..705b&link_type=abstract
Astrophysical Journal, vol. 201, Nov. 1, 1975, pt. 1, p. 705-718.
Astronomy and Astrophysics
Astrophysics
55
Cosmic Dust, Infrared Spectra, Photoionization, Planetary Nebulae, Radio Spectra, Absorption Spectra, Astronomical Models, Continuous Spectra, H Ii Regions, Helium, Ionized Gases, Line Spectra, Mathematical Models, Optical Emission Spectroscopy, Temperature Profiles
Scientific paper
The effects of dust on the ionization and thermal structure of a photoionized nebula are explored by numerical model calculations. Particular emphasis is placed on the calculation of observable quantities such as the radio and infrared continua and the optical emission-line spectrum and the effects that dust might have on these quantities. The role of the dust in the nebular structure is summarized. Model calculations of planetary nebulae are shown to agree very well with much of the radio, infrared, and optical data. The importance of dust in the case of H II regions is called into question, especially as an explanation for the low abundance of ionized helium observed in several nebulae.
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