The Extended Halos of Planetary Nebulae

Details The Extended Halos of Planetary Nebulae The Extended Halos of Planetary Nebulae

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40020f&link_type=abstract

Spitzer Proposal ID #40020

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Scientific paper

We propose to extend our study of two planetary nebulae (PNe) by further mapping of the halo region of the Helix and Ring PNe. Our previous observations showed that the main ring of the Helix is dominated by molecular hydrogen emission. The images of these PNe show the halo extending out to and beyond the region surveyed. We propose to extend the mapping to measure the extent of the PN halo and explore the physical conditions in the outer region of the nebula. This will give clues as to the mass loss history of the star, the processing of the ejected material during the PN stage of evolution, and give clues as to the structure and formation mechanism of the PNe. We will also image the halos of several other PNe to characterize their structure.

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