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A kinematic and proper-motion survey of the Cygnus Loop
H-alpha radial velocities, line widths, and line intensities based on 71Fabry-Perot interferometer scans of 61 fields in the Cygnus Loopsupernova remnant SNR are reported. Also, measurements of proper motionsat 39 locations within the Cygnus Loop are summarized. These resultsshow that the remnant is expanding asymmetrically into the ambientinterstellar medium, with rest-frame velocities as high as 380 km/s inthe near half and 150 km/s in the far half. This can plausibly beinterpreted as the result of the progenitor's evolution near a densitydiscontinuity, the consequent formation of a cavity and partial shell,and the SN's interaction with that shell. The remnant's opticallyobserved filamentary structure results from line-of-sight effects asshock waves advance into the irregular inner surface of the shell. Inthis context, the derived expansion velocities and proper motions give aformal distance to the Cygnus Loop of roughly 600 pc, with 1-sigmalimits of 300 and 1200 pc.
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