• Corpus ID: 118975242

Measurements of 12C/13C ratio in planetary nebulae: implications on stellar and Galactic chemical evolution

@article{Palla1999MeasurementsO1,
  title={Measurements of 12C/13C ratio in planetary nebulae: implications on stellar and Galactic chemical evolution},
  author={Francesco Palla and Rafael Bachiller and Letizia Stanghellini and Monica Tosi and Daniele Galli},
  journal={arXiv: Astrophysics},
  year={1999}
}
We present the results of a study aimed at determining the 12C/13C ratio in two samples of planetary nebulae (PNe) by means of millimeter wave observations of 12CO and 13CO. The first group includes six PNe which have been observed in the 3He+ hyperfine transition by Balser et al. (1997); the other group consists of 22 nebulae with rich molecular envelopes. We have determined the carbon isotopic ratio in 14 objects, 9 of which are new detections. The results indicate a range of values of 12C… 

References

Strasbourg-ESO Catalogue of Galactic Planetary Nebulae
A list of 1820 objects, each of them called at least once a planetary nebula, has been inspected; 1143 of them have been classified as true or probable planetary nebulae by the authors of the