Abstract

ABSTRACT We have measured 20-33 fluxes for the planetary nebulae NGC 7027 and BD +30 3639 and have found significant discrepancies with respect to previously published data for that spectral region. Our observations of NGC 7027 blend smoothly with infrared data at shorter and longer wavelengths, and therefore we infer that ad hoc assumptions about grain emissivity or the spatial distribution of dust may not be required to match the infrared continuum. Our photometry also suggests that the dust boundary temperature is lower for NGC 7027 than for BD +30 3639. Key words: infrared sources - planetary nebulae

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