A comparison of forbidden-line and optical continuum electron temperatures in gaseous nebulae

Astronomy and Astrophysics – Astrophysics

Scientific paper

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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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