Other
Scientific paper
Aug 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993azh....70..691g&link_type=abstract
Astronomicheskij Zhurnal, vol. 70, p. 691
Other
4
Planetary Nebulae, Chemical Composition, Galactic Halos, Photoionization, Nuclear Fusion, Star Formation
Scientific paper
A novel method for determining the chemical composition of planetary nebulae is proposed. The correlations between the abundances of different ions obtained from photoionization models of planetary nebulae luminescence are used to take the observed ionization stages into account. Simple approximation expressions for determining the content of He/H, C/H, N/H, O/H, Ne/H, Mg/H, Si/H, and Ar/H are found. Refined values for the chemical composition of five planetary nebulae of the Galactic halo are given. The abundances of heavy elements found in these nebulae are an average of 25 percent less than those found by other authors. For nitrogen and sulphur this deviation reaches an average of 50 percent.
Dmiterko V. I.
Golovatyj V. V.
Mal'Kov Yu. F.
Rokach Oleg V.
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