Physics
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9489o&link_type=abstract
HST Proposal ID #9489
Physics
Hst Proposal Id #9489
Scientific paper
We propose to acquire STIS slitless spectra of a well defined cometary knot in the inner part of the the Helix Nebula while at the same time making WFPC2 and NICMOS H_2 images in the outer parts. This program exploits a unique opportunity to pursue one scientific goal simultaneously with three HST instruments. The primary goal is to determine accurately the structure of the cometary knots in their neutral cores and their ionized zones, thus allowing development of models that can predict their future in terms of dissipation {or not} as they enter the ISM. The STIS spectra will detail the ionized structure of an inner knot, the NICMOS H_2 will supplement WFPC2 dust extinction information in detailing the structure of the neutral cores, and the WFPC2 observations will determine the general characteristics in the outer regions, thus allowing us to establish how they originate. Only the HST has sufficient spatial resolution to undertake this project. Understanding these cometary knots is essential for understanding the process of recycling material into the ISM for they contain about half of all the material being inserted by planetary nebulae.
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