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Photometry of a bright filament in the Orion nebula (1975)

Dufour, R. J. ; Mathis, J. S.

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Publication Date: 2011-08-16

Description: 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.

Keywords: ASTRONOMY

Type: Astronomical Society of the Pacific; vol. 87

Format: text

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