Keywords
Atomic Collisions
Chemical Composition
Emission Spectra
Helium Atoms
Line Spectra
Planetary Nebulae
Abundance
Astronomical Photometry
Atomic Excitations
H Ii Regions
Luminous Intensity
Astrophysics
Planetary Nebulae:Chemical Composition
Planetary Nebulae:Helium
Planetary Nebulae:Temperatures
Chemical Composition
Emission Spectra
Helium Atoms
Line Spectra
Planetary Nebulae
Abundance
Astronomical Photometry
Atomic Excitations
H Ii Regions
Luminous Intensity
Astrophysics
Planetary Nebulae:Chemical Composition
Planetary Nebulae:Helium
Planetary Nebulae:Temperatures
How to Cite
Chemical composition of Type I planetary nebulae. Collisional excitation effects on He I line intensities. (1987). Revista Mexicana De Astronomía Y Astrofísica, 14(1), 540. https://astronomia.unam.mx/journals/rmxaa/article/view/1987rmxaa..14..540p
Abstract
Relative abundances of H, He, C, N, O, Ne, S, Cl, and Ar are derived from photoelectric spectrophotometry of emission lines in the 3400-7400 A region for several type I, He-N rich planetary nebulae. Consideration of the collisional excitation from the He I 2 3S level indicates that there is a very efficient process of depopulation, probably ionization, which reduces collisional effects. It is suggested that the collisional excitation from the 2 3S level in metal-poor extragalactic H II regions is almost negligible.Similar Articles
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