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Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9839g&link_type=abstract
HST Proposal ID #9839
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Hst Proposal Id #9839 Ism And Circumstellar Matter
Scientific paper
A high-spatial resolution study of recombination lines {RLs} in bright compact planetary nebulae {PNs} is proposed. Many PNs show a large discrepancy between abundances derived from O II RLs and those derived from [O III]. Others show little or no discrepancy. The PNs with small discrepancies are more compact and high surface brightness. This program seeks to understand why PNs show such differences by studying the RLs at high spatial resolution in the compact PNs NGC 6572 and NGC 6790, which show no discrepancy between O II and [O III], to compare with ground-based studies of the larger PNs NGC 6153 and NGC 6720. The goal is to determine if the distribution of RL emission in NGC 6572 and NGC 6790 is more consistent with radiative recombination than in NGC 6720, where the RL emission is more centrally peaked than [O III]. This will allow us to demonstrate whether or not it is the RLs that are preferentially enhanced in the nebulae with large discrepancies. The Cat's Eye nebula NGC 6543 will also be observed, to determine if the enhanced RL emission is connected to the presence of X-ray emitting gas, as might be expected if the enhanced RLs are a result of high temperature dielectronic recombination.
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