Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...227..863b&link_type=abstract
Astrophysical Journal, Part 1, vol. 227, Feb. 1, 1979, p. 863-869.
Astronomy and Astrophysics
Astrophysics
21
Abundance, Electron Energy, Forbidden Bands, Nebulae, Planetary Nebulae, Hydrogen Clouds, Line Spectra, Temperature Measurement
Scientific paper
Photoelectric scanner observations have been made of the Balmer and Paschen discontinuities in several positions in a number of planetary nebulae and the Orion Nebula. Electron temperatures determined from these measurements are shown to be in generally good agreement with those found from forbidden lines; there is definitely no evidence that forbidden-line electron temperatures are systematically higher, as some previous investigations have found. This result suggests that in some studies metal-to-hydrogen abundance ratios in gaseous nebulae have been overestimated by nearly a factor of 2.
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