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The Remarkable Molecular Content of Planetary Nebulae

Published online by Cambridge University Press:  04 September 2018

D. R. Schmidt  and
L. M. Ziurys
D. R. Schmidt
Affiliation:
Department of Astronomy, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85719 email: [email protected]
L. M. Ziurys
Affiliation:
Department of Astronomy, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85719 email: [email protected] Department of Chemistry and Biochemistry, University of Arizona, 1306 E. University Blvd., Room 221, Tucson, AZ 85721 email: [email protected]
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Abstract

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In order to further define the molecular content of planetary nebulae (PNe), we have conducted searches for HCN, HCO+, HNC, and CCH at millimeter wavelengths in a sample of seventeen PNe using the new 12 m and Sub-Millimeter Telescopes of the Arizona Radio Observatory (ARO). HCN and HCO+ were identified in 75% of the PNe, with corresponding fractional abundances of f(HCN/H2) ~ 0.1-9.1 × 10−7 and f(HCO+/H2) ~ 0.04-7.4 × 10−7. HNC was subsequently identified in twelve PNe with f(HNC/H2) ~ 0.02-2.2 × 10−7. The [HCN]/[HNC] ratio was found to be ~1-8 in nebulae observed. CCH was also detected in eight PNe. The abundances for all molecules were found to remain relatively constant with nebular age across 10,000 years, in contrast to model predictions. They are also 10-100 greater than those observed in diffuse clouds, and suggest that molecular material from PNe seed the diffuse ISM.

Keywords

ISM: molecules - planetary nebulae: general - radio lines: ISM
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S332: Astrochemistry VII: Through the Cosmos from Galaxies to Planets , March 2017 , pp. 218 - 224
Copyright
Copyright © International Astronomical Union 2018 

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