Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...246..434f&link_type=abstract
Astrophysical Journal, Part 1, vol. 246, June 1, 1981, p. 434-443.
Astronomy and Astrophysics
Astrophysics
47
Abundance, Argon, Gas Ionization, Planetary Nebulae, Cosmic Gases, H Ii Regions, Helium, Hydrogen, Line Spectra, Neon, Oxygen, Solar System, Sulfur
Scientific paper
Line fluxes in the range 3500-8000 A have been obtained for 11 planetary nebulae and an H II region. A procedure which assumes that the observable ionization stages of argon (A(++), A(3+), and A(++)) coexist with those of helium (He(+) and He(++)) is found to yield argon abundances which are not correlated with the ionization level of the nebula and which are similar to previous determinations and to the solar system value. The standard procedures for deriving helium, oxygen, and neon abundances are found to work reliably in this study; there may be problems for nitrogen. A new procedure for deriving sulfur abundances is suggested; it too yields results which are not correlated with ionization level and which are close to the solar system value.
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