Revisiting the Formation of HeH+in the Planetary Nebula NGC 7027

R. C. Forrey, J. F. Babb, E. D.S. Courtney, R. T. McArdle, P. C. Stancil

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11 Scopus citations


From four independent calculations using three different theoretical approaches, rate coefficients for the formation of HeH+ via the radiative association of He+ and H were computed. Good agreement is found between our new calculations and prior results obtained two decades ago for kinetic temperatures between ∼800 and 20,000 K. This finding is inconsistent with a recent claim in the literature of a wide variation in published values and establishes the robustness of our knowledge of this process for the formation of HeH+. The implications of the current results to the first detection of HeH+ and its modeled abundance in the planetary nebula NGC 7027 are discussed.

Original languageEnglish (US)
Article number86
JournalAstrophysical Journal
Issue number1
StatePublished - Jul 20 2020

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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