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The planetary nebula (PN) NGC 5189 around a Wolf-Rayet [WO] central stardemonstrates one of the most remarkable complex morphologies among PNe withmany multi-scale structures, showing evidence of multiple outbursts from an AGBprogenitor. In this study we use multi-wavelength Hubble Space Telescope WideField Camera 3 (WFC3) observations to study the morphology of the inner 0.3 pc$\times$ 0.2 pc region surrounding the central binary that appears to be arelic of a more recent outburst of the progenitor AGB star. We applieddiagnostic diagrams based on emission line ratios of H$\alpha$ $\lambda$6563,[O III] $\lambda$5007, and [S II] $\lambda\lambda$6717,6731 images to identifythe location and morphology of low-ionization structures within the innernebula. We distinguished two inner, low-ionization envelopes from the ionizedgas, within a radius of 55 arcsec ($\sim$ 0.15 pc) extending from the centralstar: a large envelope expanding toward the northeast, and its smallercounterpart envelope in the opposite direction toward the southwest of thenebula. These low-ionization envelopes are surrounded by a highly-ionizedgaseous environment. We believe that these low-ionization expanding envelopesare a result of a powerful outburst from the post-AGB star that created shockedwind regions as they propagate through the previously expelled material along asymmetric axis. Our diagnostic mapping using high-angular resolution lineemission imaging can provide a novel approach to detection of low-ionizationregions in other PNe, especially those showing a complex multi-scalemorphology.

Mapping Excitation in the Inner Regions of the Planetary Nebula NGC 5189 using HST WFC3 Imaging