Computer Science
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8726o&link_type=abstract
HST Proposal ID #8726
Computer Science
Hst Proposal Id #8726 Ism And Circumstellar Matter
Scientific paper
Cometary Knots trap a significant fraction of all the ejected material in the closest of the Planetary Nebulae, NGC 7293. This means that these knots may transport material into free space in a highly preserved state, possibly as solid bodies, a consequence of some import to understanding the composition of the interstellar medium. Recent HST and VLT results indicate that the Cometary Knots are actually quite common among a sampling of nearby Planetary Nebulae, so that it is likely they are a natural part of the expulsion of material by intermediate mass stars. We propose second epoch observations of the Cometary Knots in NGC 7293 in order to get a better idea of just how these objects are formed by comparison of their spatial motions with that of the ambient gas. We also propose observations of four Planetary Nebulae that give indications of the presence of Cometary Knots at different phases of development. These observational data will be used to quantitatively assess the masses, ubiquity, and probable survival of Cometary Knots in the sample. Added to our knowledge of the Cometary Knots in NGC 7293, the set should be large enough to allow drawing general conclusions about their role in the Planetary Nebula phenomenon and the interstellar medium.
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