Cometary Forms in the Helix Nebula

Details Cometary Forms in the Helix Nebula Cometary Forms in the Helix Nebula

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5977o&link_type=abstract

HST Proposal ID #5977

Computer Science

Hst Proposal Id #5977 Interstellar Medium

Scientific paper

The nature of the cometary forms seen in the Helix Nebula, NGC 7293 are an unresolved puzzle. The fact that this is the closest of the planetary nebulae indicates that we may be seeing a phenomenon simply unresolved in the more distant planetaries. The interpretation of these forms ranges from the straightforward explanation of their being instabilities, to interpretations having far greater impact, such as being remnants of the extended envelope of the precursor star, to being components of an Oort Cloud of comets formed when the precursor star was created. The emission line filter images that we propose for the WFPC2 would provide direct and quantitative information that will allow resolution of the nature of these objects.

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