Proceedings of the International Astronomical Union

Table of Contents - 2006 - Volume 2, Symposium S234 (Planetary Nebulae in our Galaxy and Beyond)  

Planetary Nebulae in our Galaxy and Beyond
Contributed Papers

Evolution of Molecular Gas in Planetary Nebulae

Dana S. Balser a1 and Joseph P. McMullin a2
a1 National Radio Astronomy Observatory, Green Bank, WV, 24944, USA
a2 National Radio Astronomy Observatory, Socorro, NM, 87801, USA

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balser ds   [Google Scholar] 
mcmullin jp   [Google Scholar] 
 
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Abstract

Observations of molecular gas at 7 mm are made with the Green Bank Telescope (GBT) in a sample of planetary nebulae (PNe). PNe were selected to test stellar evolution models that include extra mixing processes induced by rotation by directly measuring the isotopic abundance ratios of processed material that has escaped the progenitor star. Moreover, these data are used to probe theories of chemical evolution through a sample of AGB stars, protoplanetary nebulae, and young and evolved PNe. One goal is to constrain the timelines and list of tracers for studying the molecular emission in these sources and examine the role of clumping for different species.


Key Words: radio lines: stars; molecular data.

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