Temperatures and abundances in the outer Orion Nebula

Details Temperatures and abundances in the outer Orion Nebula Temperatures and abundances in the outer Orion Nebula

May 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...229..962m&link_type=abstract

Astrophysical Journal, Part 1, vol. 229, May 1, 1979, p. 962-970.

Astronomy and Astrophysics

Astrophysics

22

Abundance, Gas Temperature, Mass Ratios, Nebulae, H Alpha Line, H Beta Line, Hydrogen Clouds, Oxygen, Temperature Gradients

Scientific paper

Temperatures have been measured optically at four outlying points in the northwestern quadrant of the Great Nebula in Orion (M42) and in the nebular core. The results do not support claims of steep temperature and abundance gradients across the Orion Nebula. At a position 7.3 arcmin from the primary ionizing star Theta-1 Ori C the forbidden O III temperature is 9000 + or - 400 K, close to the temperature 8430 + or - 80 K found in the core 30 arcsec west of Theta-1. The oxygen abundance relative to hydrogen is (2.3 + or - 0.4) x 10 to the -4th, marginally lower than the value (3.7 + or - 0.3) x 10 to the -4th measured close to Theta-1 C. The N/O abundance ratio is 0.13 + or - 0.04, consistent with 0.11 + or - 0.02 found near the Trapezium.

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