Narrow-Band Imaging of Hydrogen-Poor Planetary Nebulae Cycle 4 High

Details Narrow-Band Imaging of Hydrogen-Poor Planetary Nebulae Cycle 4 High Narrow-Band Imaging of Hydrogen-Poor Planetary Nebulae Cycle 4 High

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5404h&link_type=abstract

HST Proposal ID #5404

Physics

Hst Proposal Id #5404 Interstellar Medium Planetary Nebulae

Scientific paper

There is an exceptional group of PNe with nebular gas that consists of nearly undiluted products of nuclear burning. These hydrogen-poor PNe are thought to result when a final helium shell flash occurs after the complete removal of the hydrogen envelope. Four of the five currently known H-poor PNe are Cycle 2 HST spectroscopic targets. Complementary [O III] 5007 HST imaging of two nebulae has revealed remarkable `cometary' structures, consisting of compact (0".15 - 0".5) knots with radial tails several arcsec in length. We interpret this morphology in terms of dense H-poor condensations whose outer expanding layers are swept outwards by mass-loaded stellar winds. We propose narrow-band (He I, He II, and [O III]) imaging of these cometary structures in A30, and [O III] imaging of two remaining H-poor PNe where such dynamical structures are expected. These images are crucial for interpreting UV spectra of H-poor PNe. Optical imaging combined with UV data will provide fundamental information: (1) on helium-burning nucleosynthesis, by determining the ionic concentrations of H and He burning products; (2) on the interaction of the several thousand km/sec stellar winds with the nearby clumps of nebular material, resulting in mass-loaded outflows; (3) on the ram-pressure stripping of a H-poor PN in the globular cluster M22 by the interstellar medium; (4) on physics of very dusty H-poor gas, with grain photoelectrons dominating energy balance.

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