Isophotes of a field in the Cygnus Loop photographed in the forbidden O III and forbidden N II + H-alpha lines

Details Isophotes of a field in the Cygnus Loop photographed in the forbidden O III and forbidden N II + H-alpha lines Isophotes of a field in the Cygnus Loop photographed in the forbidden O III and forbidden N II + H-alpha lines

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982pazh....8..679s&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 8, Nov. 1982, p. 679-684) Soviet Astronomy Letters (ISSN 0360-0327), vol. 8, Nov.-Dec.

Astronomy and Astrophysics

Astronomy

2

Astronomical Photography, Cygnus Constellation, Forbidden Bands, H Alpha Line, Isophotes, Data Reduction, Emission Spectra, Gas Temperature, Nitrogen, Oxygen, Radiative Heat Transfer, Sabatier Reaction, Shock Waves, Stellar Spectrophotometry

Scientific paper

From interference-filter image-tube photographs of a 9 arc min field in the western part of the Cygnus Loop supernova remnant, taken in the 5007 forbidden O III and 6584, 6563 forbidden N II + H-alpha lines, sets of isophotes are derived by an equidensitometry technique based on the Sabattier effect. The emission regions in these lines exhibit a relatively displacement, interpreted as evidence for radiative cooling of the gas behind the shock generated in the supernova outburst. An explanation is offered for the differing morphology of the nebular filaments in the forbiddden O III and forbidden N II + H-alpha lines. The anomalously high I (O III)/I(H-beta) intensity ratio may reflect a spatial separation of the corresponding emission zones.

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