The optical expansion parallax of NGC 6543 has been detected and measured using two epochs of Hubble Space Telescope images separated by a time baseline of only 3 years. We have utilized three separate methods of deriving the angular expansion of bright fiducials, with excellent agreement in the results. We combine our angular expansion estimates with spectroscopically obtained expansion velocities to derive a distance to NGC 6543 of 1001 ± 269 pc. The deduced kinematic age of the inner bright core of the nebula is 1039 ± 259 yr; however, the kinematic age of the polar caps that surround the core is larger—perhaps the result of deceleration or earlier mass ejection. The morphology and expansion patterns of NGC 6543 provide insight into a complex history of axisymmetric, interacting stellar mass ejections.
展开▼
机译：NGC 6543的光学膨胀视差已使用哈勃太空望远镜影像的两个时期（仅以3年为基准时间间隔）进行了检测和测量。我们使用了三种单独的方法来推导明亮基准点的角扩展，在结果上有很好的一致性。我们将角度扩展估计值与通过光谱获得的扩展速度结合起来，得出到NGC 6543的距离为1001±269 pc。推算出的星云内部亮核的运动年龄为1039±259 yr;但是，围绕磁芯的极帽的运动学年龄更长-可能是减速或较早的质量抛射的结果。 NGC 6543的形态和扩展模式提供了对轴对称，相互作用的恒星质量抛射的复杂历史的深刻见解。
展开▼
