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Spectrophotometry of the Cygnus Loop
Fesen, R. A.; Blair, W. P.; Kirshner, R. P.
AA(NASA, Goddard Space Flight Center, Laboratory for Astronomy and Solar Physics, Greenbelt, MD; Michigan, University, Ann Arbor, MI), AB(Michigan, University, Ann Arbor, MI)
Astrophysical Journal, Part 1, vol. 262, Nov. 1, 1982, p. 171-188. (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
Cygnus Constellation, Nebulae, Stellar Spectrophotometry, Supernova Remnants, Balmer Series, Electron Density (Concentration), Electron Energy, Emission Spectra, High Resolution, Hydrogen, Interstellar Matter, Line Spectra, Shock Waves
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New spectrophotometry for 17 filaments in the Cygnus Loop are presented. A wide variety of spectral properties is observed within the remnant. Comparisons with published shock models indicate significant differences between the models and observations with the range of observed line intensities not well described by models with varying shock velocity. Interference-filter photographs of the remnant's northeastern, northwestern, and western nebulae in H-alpha + N II, S II, O III, and O I show radial variations of line emission intensity with a scale much larger than that expected from a shock moving through a uniform medium. It is suggested that the emission variations and apparent ionization structure are the result of the shock front encountering an inhomogeneous interstellar medium.

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