Measurements of the 12C/13C ratio in Planetary Nebulae and implications for stellar evolution

Details Measurements of the 12C/13C ratio in Planetary Nebulae and implications for stellar evolution Measurements of the 12C/13C ratio in Planetary Nebulae and implications for stellar evolution

1997-10-03

arxiv.org/abs/astro-ph/9710040v1

Astronomy and Astrophysics

Astrophysics

8 pages, LaTeX, 1 Postscript figure. to appear in The Primordial Nuclei and Their Galactic Evolution, eds. N. Prantzos, M. Tos

Scientific paper

We present the results of a study aimed at determining the 12C/13C ratio in two samples of planetary nebuale (PNe) by means of mm-wave observations of 12CO and 13CO. The first group includes six PNe which have been observed in the 3He+ hyperfine transition; the other group consists of 23 nebulae with rich molecular envelopes. We have determined the isotopic ratio in 14 objects and the results indicate a range of values between 9 and 23. In particular, three PNe have ratios well below the value predicted by standard evolutionary models (about 20), indicating that some extra-mixing process has occurred in these stars. We briefly discuss the implications of our results for standard and nonstandard stellar nucleosynthesis.

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