Ultraviolet observations of the Cygnus Loop

Details Ultraviolet observations of the Cygnus Loop Ultraviolet observations of the Cygnus Loop

Jun 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...238..881r&link_type=abstract

Astrophysical Journal, Part 1, vol. 238, June 15, 1980, p. 881-885.

Astronomy and Astrophysics

Astronomy

53

Nebulae, Supernova Remnants, Ultraviolet Astronomy, Abundance, Iue, Line Spectra, Shock Waves

Scientific paper

The analysis of IUE observations of a filament on the western edge of the Cygnus Loop yields a shock velocity of about 130 km/sec, significantly higher than the velocity estimated from the optical spectrum. This velocity together with the high forbidden O III/H-beta ratio reported by Miller (1974) indicates that much of the hydrogen recombination region predicted by steady flow shock models is absent. This situation may occur because this part of the supernova remnant is in the shell-formation phase that accompanies the transition from the adiabatic to the snowplow phase or because the observed filament is a recently shocked cloud.

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