Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...237..486d&link_type=abstract
Astrophysical Journal, Part 1, vol. 237, Apr. 15, 1980, p. 486-490.
Astronomy and Astrophysics
Astrophysics
50
Abundance, Infrared Spectroscopy, Planetary Nebulae, Sulfur, Electron Density (Concentration), Electron Energy, Forbidden Transitions, H Ii Regions, Interstellar Matter, Line Spectra
Scientific paper
Ionic abundances of S(+), S(++), and S(+3) relative to hydrogen are determined for 12 planetary nebulae from observations of the S II forbidden lines at 6716 and 6731 A, the S III forbidden line at 9531 A, the S IV forbidden line at 10.5 microns, and P delta 10049 A. The derived total abundances are insensitive to electron density and electron temperature and are found to vary by no more than 30% in the sample; unlike previous determinations, there is no correlation of the abundance with the degree of ionization. The mean elemental abundance for these objects is S/H = 2.1 plus or minus 0.6 x 10 to the -5th, which is, within the measurement errors, the same as the solar value and the abundance in the present interstellar medium as represented by the H II regions K3-50 and Orion.
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