Other
Scientific paper
Mar 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...244..493f&link_type=abstract
Astrophysical Journal, Part 1, vol. 244, Mar. 1, 1981, p. 493-503.
Other
17
Abundance, Astronomical Models, H Ii Regions, Interstellar Gas, Nebulae, Astronomical Spectroscopy, Helium, Hydrogen Ions, Neon, Nitrogen, Oxygen, Photoionization, Sulfur, Tables (Data), Temperature Distribution
Scientific paper
The reliability of the standard procedures for deriving helium, oxygen, nitrogen, neon, and sulfur abundances in gaseous nebulae and of a proposed procedure for deriving argon abundances is investigated through the calculation of model H II regions with normal abundances and single central stars. The errors encountered at each step are examined; the combined procedures give errors less than approximately 5% for helium and less than approximately 50% for the other elements in most cases. The errors are only slightly larger if the ionization is produced by an aggregate of stars with a range of spectral types. Problems can be encountered if several H II regions are observed simultaneously (as in extragalactic objects) but probably will not be important for situations which occur in nature. The procedures work very well for low-abundance high-ionization H II regions, as are found in other galaxies.
French H. B.
Grandi Steven A.
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