Astronomy and Astrophysics – Astronomy
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987rmxaa..14..540p&link_type=abstract
(IAU, Reunion Regional Latinoamericana de Astronomia, 5th, Merida, Mexico, Oct. 6-10, 1986) Revista Mexicana de Astronomia y Ast
Astronomy and Astrophysics
Astronomy
121
Atomic Collisions, Chemical Composition, Emission Spectra, Helium Atoms, Line Spectra, Planetary Nebulae, Abundance, Astronomical Photometry, Atomic Excitations, H Ii Regions, Luminous Intensity
Scientific paper
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.
Peimbert Manuel
Torres-Peimbert Silvia
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