Stalking FLIERs in Planetary Nebualae: a STIS Study

Details Stalking FLIERs in Planetary Nebualae: a STIS Study Stalking FLIERs in Planetary Nebualae: a STIS Study

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8128p&link_type=abstract

HST Proposal ID #8128

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Hst Proposal Id #8128 Stellar Ejecta

Scientific paper

FLIERs are enigmatic pairs of small, low-ionization knots located on opposite sides of the central star of many PNe. Their symmetric locations, equal, opposite and supersonic Doppler shifts {Mach 3-5}, and highly enriched N/O ratios { 3- 7} suggest that they are peculiar spitballs ejected recently from the stellar interior. As expected, WFPC2 studies spatially resolved the FLIERs and revealed the presence of bow shocks -- but unexpectedly, the tails point precisely in the wrong direction. Bow shock models also predict the highest ionization at the head of the shock. FLIERS always exhibit the reverse ionization gradient. What are FLIERs? Where do they come from? What clues can we uncover about their state and history? How do they relate to their surroundings? How do they differ from other knots which aren't FLIERs? Our goal is to use STIS at high dispersion to study the hydrodynamic state {e.g. velocity field, shocks, etc.} and low dispersion to study the physical and che mi cal state of FLIERs and nonFLIERs alike. The hydrodynamic results can be compared directly to predictions of calculations of Oort-Spitzer "rockets", dense bullets, and the ablation flows of knots in a strong mechanical wind {``mass-loaded flows''}. The photometric data will be used to understand the density, temperature, and abundances and their distributions within FLIERs.

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