Photometry of a bright filament in the Orion nebula

Details Photometry of a bright filament in the Orion nebula Photometry of a bright filament in the Orion nebula

Apr 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975pasp...87..345d&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 87, Apr. 1975, p. 345-348. NSF-supported research.

Astronomy and Astrophysics

Astronomy

6

Abundance, Hydrogen Ions, Interstellar Matter, Nebulae, Astronomical Photometry, Electron Density (Concentration), Filaments, Interstellar Radiation, Photoionization, Shock Fronts

Scientific paper

The spectrum of a bright filament in the outer portion of the Orion nebula, 14 min from the Trapezium, was studied. The temperature of the filament, derived from /N II/ lambda 5755/6583 ratio, is 9560 K. The electron density (from /S II/ lambda 6717, 6731) is low: 360 plus or minus 150 per cu cm. The ionic abundances of He(+), N(+), O(++), and S(-) are about the same as Peimbert and Costero (1969) found in regions in Orion closer to the Trapezium. It is concluded that the filament is photoionized, presumably by the Trapezium, rather than a shock front, as had originally been suspected.

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