Molecules in Dense Globules in Planetary Nebulae

Details Molecules in Dense Globules in Planetary Nebulae Molecules in Dense Globules in Planetary Nebulae

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.271..811h&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 271, NO. 4/DEC15, P. 811, 1994

Astronomy and Astrophysics

Astronomy

20

Scientific paper

We have investigated the formation of molecules in a dense, neutral globule, such as those observed in the Helix nebula (NGC 7293). We find that H2 and CO can possess large abundances in cold gas throughout the bulk of the globule, in spite of the enhanced photon field provided by the central star. Emission from C2H and CN wili be detectable from individual globules if they are carbon-rich. The temperature in the boundary layer between a globule and the wind of the nebula's central star is estimated, and found to be too low for neutral-neutral reactions to cause most boundary-layer oxygen to be in OH and H20. Key words: ISM: globules - ISM: molecules - planetary nebulae: general - planetary nebulae: individual: Helix nebula.

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