Observations of interstellar H2/C-13/O/H2C/O-18/ abundance ratios

Details Observations of interstellar H2/C-13/O/H2C/O-18/ abundance ratios Observations of interstellar H2/C-13/O/H2C/O-18/ abundance ratios

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.194p..37g&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 194, Mar. 1981, p. 37P-41P.

Other

9

Abundance, Carbon Isotopes, Formaldehyde, Interstellar Gas, Molecular Clouds, Oxygen Isotopes, Absorption Spectra, Carbon 12, Carbon 13, Isotope Effect, Line Spectra, Oxygen 18

Scientific paper

The 4388-MHz transition of H2C18O and the 4593-MHz transition of H213 CO have been measured in 10 molecular clouds. The median value of the [H213 CO] / [H2C18O] abundance ratio (7.7) is higher than values obtained in other studies. The mean value for the three cases near the Galactic Centre (10.5 ± 0.6) is 50 per cent higher than the value outside the centre (7.0 ± 0.5), which is closer to the terrestrial value of 5.5 for the [13C/12C] I [18O/16O] abundance ratio.

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