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Fig. 1

image

Spitzer IRS data at the tip of both IC 63 and IC 59. SL datasets are shown in red rectangles, and LL datasets are depicted in yellow. IC 59 data were acquired on the same day, and with the same instrument and settings asthe IC 63 data. The background samples were chosen by checking for non-negative pixels in the background-subtracted spectra of different regions in IC 63 as well as in IC 59 in order to isolate the mid-IR emission coming from both nebulae. The image of both nebulae has been taken from the Astronomy Picture of the Day archive (http://apod.nasa.gov/apod/ap111103.html; image credit Ken Crawford). The white arrows point toward the star γCas, which is about 20 arcmin from the tip of IC 63.

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