CNO abundances and temperature fluctuations in the Orion Nebula

Details CNO abundances and temperature fluctuations in the Orion Nebula CNO abundances and temperature fluctuations in the Orion Nebula

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...397..196w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 397, no. 1, p. 196-213.

Astronomy and Astrophysics

Astrophysics

56

Abundance, Charge Coupled Devices, H Ii Regions, Interstellar Matter, Iue, Orion Nebula, Carbon, Hydrogen, Nitrogen, Oxygen

Scientific paper

The largest UV-optical data base to date of the Orion Nebula has been assembled, and the CNO abundances their distribution at a statistically significant number of positions to the north and west of the Trapezium and out to a distance of 5 arcmin has been examined. The forbidden O III temperature increases with distance from Theta1 Ori C while the forbidden N II temperature decreases with increasing distance. The density decreases as a function of increasing distance from Theta1 Ori C. The C/H, N/H, O/H, and C/O distributions are constant across the inner 5 arcmin of the northwestern quadrant of the nebula. The empirically determined mean C/H abundance calculated from UV lines is almost a factor of two lower in the number density than earlier estimates. Photoionization model calculations are consistent with a solar abundance for N/H and O/H.

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