The abundance ratio (/sup 17/O)/(/sup 18/O) in dense interstellar clouds
Journal Article
·
· Astrophys. J., Lett.; (United States)
We have measured the interstellar (/sup 17/O)/(/sup 18/O) isotope abundance ratio in eight giant molecule clouds using the J=1..-->..J=0 transition of carbon monoxide at approx.2.7 mm. The average interstellar ratio derived from these data is 0.24, a value which is significantly higher than the corresponding terrestrial abundance ratio of 0.186. There is weak evidence of source-to-source variation of the abundance ratio, but the maximum deviation from the mean value of 0.24 is 40 percent. An increase in the (/sup 17/O)/(/sup 18/O) interstellar abundance ratio since the time of formation of the solar system is consistent with current knowledge of nucleosynthesis. (AIP)
- Research Organization:
- Department of Physics and Astronomy, University of Massachusetts, Amherst
- OSTI ID:
- 7270166
- Journal Information:
- Astrophys. J., Lett.; (United States), Journal Name: Astrophys. J., Lett.; (United States) Vol. 205:3; ISSN AJLEA
- Country of Publication:
- United States
- Language:
- English
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