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| - The electron temperature of the inner halo of the Planetary Nebula NGC 6543
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| - We investigate the electron temperature of the inner halo and nebular core regions of NGC 6543, using archival Hubble Space Telescope ( HST) Wide Field Planetary Camera 2 ( WFPC2) images taken through narrow band [O iii] filters. Balick et al. ([CITE]) showed that the inner halo consists of a number of spherical shells. We find the temperature of this inner halo to be much higher (~15 000 K) than that of the bright core nebula (~8500 K). Photo-ionization models indicate that hardening of the UV radiation from the central star cannot be the main source of the higher temperature in the halo region. Using a radiation hydrodynamic simulation, we show that mass loss and velocity variations in the AGB wind can explain the observed shells, as well as the higher electron temperature.
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