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

Apr 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998ssrv...84..177p&link_type=abstract

Space Science Reviews, v. 84, Issue 1/2, p. 177-183 (1998).

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2

Stars: Abundances, Planetary Nebulae: General, Radio Lines: Stars, Ism

Scientific paper

We present the results of a study aimed at determining the 12C/13C ratio in two samples of planetary nebulae (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 (>~ 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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