CNO isotopes in astrophysics

The papers deal with observations and abundance determinations of CNO isotopes in the solar system, stars, and the interstellar medium, as well as with the nucleosynthesis and chemical evolution of these isotopes. Topics include the general importance of CNO isotopes in astrophysical investigations, oxygen anomalies in meteorites, the N-15/N-14 ratio in the solar wind, possible large C and N abundance variations in horizontal-branch members of the globular cluster M92, CNO isotope ratios in red giants, the carbon abundance of the planetary nebula NGC 7027, CNO nucleosynthesis in classical nova outbursts, a nova model with a normal CNO abundance, CNO abundance ratios in molecular clouds, and the interstellar C-12/C-13 isotope ratio toward Zeta Oph. Other contributions discuss C-12/C-13 isotope ratios in the interstellar medium, chemical fractionation of CO in the dust cloud Lynds 134, chemical fractionation of C-13 in Sgr B2, an analysis of carbon-isotope fractionation in interstellar clouds, the possible depletion of CNO in the interstellar medium, CNO cycles, cross-section measurements of relevance to CNO nucleosynthesis, environments for CNO nucleosynthesis, and the galactic evolution of N-15.