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Published December 11, 2007 | Published
Journal Article Open

A search for CO^+ in planetary nebulae

Abstract

We have carried out a systematic search for the molecular ion CO^+ in a sample of eight protoplanetary and planetary nebulae in order to determine the origin of the unexpectedly strong HCO^+ emission previously detected in these sources. An understanding of the HCO^+ chemistry may provide direct clues for the physical and chemical evolution of planetary nebulae. We find that the integrated intensity of the CO^+ line may be correlated with that of HCO^+, suggesting that the reaction of CO^+ with molecular hydrogen may be an important formation route for HCO^+ in these planetary nebulae.

Additional Information

© 2007 The Authors. Journal compilation © 2007 RAS. Accepted 2007 August 27. Received 2007 August 8; in original form 2007 January 27. We thank the referee for constructive comments which helped to improve an earlier draft of this paper. The JCMT is operated by The Joint Astronomy Centre on behalf of the Science and Technology Facilities Council of the United Kingdom, the Netherlands Organisation for Scientific Research and the National Research Council of Canada. The data were obtained under the programs M05AU10 and M05BU78. TAB and WW are supported by PPARC studentships. SV acknowledges individual financial support from a PPARC Advanced Fellowship.

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August 23, 2023
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