Other
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8285l&link_type=abstract
HST Proposal ID #8285
Other
Hst Proposal Id #8285 Stellar Ejecta
Scientific paper
We will make new STIS observations to study the UV/visible light properties of the young planetary nebula NGC 7027. NGC 7027 and other objects in this class display remarkable complexity that has prevented a full understanding of post-asymptotic giant branch stellar evolution. With NICMOS we have imaged several such objects in molecular hydrogen and other filters. H2 emission can probe shocks {winds/jets} and the photodissociation region through near-IR emission. To unravel the complex structure {spatial and kinematic} and distinguish between excitation mechanisms {UV or shock}, we are following our NICMOS observations with STIS. We will use STIS in various long slit modes {low and medium resolution and echelle} to achieve the following objectives: {i} Spatially separate shock structures from radiatively excited regions by looking at diagnostic lines such as SII, {ii} obtain kinematic information in the vicinity of the ionized gas-photodissociation region interface and { iii} interpret the spatially resolved results from {i} and {ii} in light of the ``interacting stellar winds'' theories, in which the PN morphology is created as the fast PN wind plows into the slower, denser AGB wind. We require observations with HST to get the highest possible spatial resolution and stability for line ratio studies throughout the complex nebulae. Several emission lines have been selected to be observed at high spectral resolution for measurement of wind velocities and structure.
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