NEAR-INFRARED AND MIDINFRARED IMAGING OF THE PLANETARY-NEBULAE BD -DEGREES-3639 AND IC-418(30)

We present near- and mid-infrared images of the planetary nebulae BD 30-degrees-3639 and IC 418 with a unique combination of high spatial and spectral resolution. The mid-infrared images were obtained with MI RAC, a new IR array camera. For BD + 30-degrees-3639, the mid-IR image s at 10.0, 11.2, 12.4, 12.8, and 13.2 mum have allowed us to separate the various spectral emission components such as the broad UIR feature s (perhaps from large molecular grains), the 12.8 mum Ne II! emission feature, and continuum emission to determine the distribution of thes e components in the nebula. The derived temperature and opacity images show the detailed distribution of temperature and relative density of the dust. For IC 418, we have obtained high-resolution images in both the near- and mid-infrared. The images in the near-infrared at J, H, and K are important for determining the source of the IR excess; we ha ve determined that one component of the excess is located near the cen tral star and is possibly due to nonequilibrium heating of small grain s. We have also imaged the halo emission at H and K, which has been de tected in earlier studies, and have determined its spatial extent. The mid-IR images at 9.8 and 11.7 mum show continuum emission coincident with the ionized zone and suggest that silicon carbide emission origin ates from the region near the central star.