Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986afz....25..329g&link_type=abstract
(Astrofizika, vol. 25, Sept.-Oct. 1986, p. 329-343) Astrophysics (ISSN 0571-7132), vol. 25, no. 2, March 1987, p. 542-551. Trans
Astronomy and Astrophysics
Astrophysics
Abundance, Chemical Composition, Crab Nebula, Spectrum Analysis, Electron Energy, Gas Ionization, Helium, Hydrogen, Oxygen
Scientific paper
The results are given of a quantitative analysis of the chemical composition of the filaments in the Crab nebula based on the numerous published spectra of individual filaments. The method employed is based on a comparison of the relative abundances obtained from observations for two adjacent ionization stages of one element - for example, O(2+)/He(+) and O(+)/He(+) - with the analogous ratios calculated for a model with known chemical composition and the same gas ionization. Nomograms convenient for rapid determination of the chemical composition have been constructed. It is shown that the mean helium abundance in the filaments is somewhat greater than the normal abundance, while the He/H values range from 0.2 to 1.4 in different filaments. There is also an appreciable dispersion of the abundances for the heavy elements. However, the strong dependence of the observed number of ions radiating forbidden lines on the electron temperature and the large uncertainty of this temperature make reliable determination of these abundances impossible.
Golovatyi V. V.
Pronik Vladimir I.
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