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HD 198612


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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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观测天体数据

星座:天鵝座
右阿森松:20h50m32.84s
赤纬:+29°58'39.2"
视星:8.66
距离:307.692 天文距离
右阿森松适当运动:3.2
赤纬适当运动:-6.2
B-T magnitude:8.9
V-T magnitude:8.68

目录:
适当名称
HD 1989HD 198612
TYCHO-2 2000TYC 2183-139-1
USNO-A2.0USNO-A2 1125-17199226
HIPHIP 102871

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