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Paper: [FeII] Bubbles in Hubble 12
Volume: 199, Asymmetrical Planetary Nebulae II: From Origins to Microstructures
Page: 271
Authors: Welch, C. A.; Frank, A.; Pipher, Judith L.; Forrest, W. J.; Woodward, Charles E.
Abstract: We present near-infrared (NIR) images of the young planetary nebulae Hubble 12 and BD +30deg3639. We have discovered bright, symmetric bubbles of [FeII] line emission in Hubble 12. While NIR spectra of Hubble 12 (Hora & Latter 1996, etc.) have revealed UV-excited H2 fluorescence near the central star, the [FeII] emission is most likely shock-excited. [FeII] line emission is also evident in BD +30deg3639, as is emission from the 3.29 μm and 3.40 μm PAH dust features. The spatial distributions of these three emission features are very similar, mostly interior to the H2 emission (Shupe et al. 1998), and approximately cospatial with the outer edge of the HII region (Bryce et al. 1997, Harrington et al. 1997). This configuration is suggestive of a photo-dissociation region (PDR).
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