Isotopic ratios from 6.8 centimeter observations of H2C/O-18/

Details Isotopic ratios from 6.8 centimeter observations of H2C/O-18/ Isotopic ratios from 6.8 centimeter observations of H2C/O-18/

Feb 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...227l.143t&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 227, Feb. 1, 1979, p. L143-L146. Research supported by the Research

Astronomy and Astrophysics

Astronomy

11

Carbon Isotopes, Formaldehyde, Interstellar Matter, Oxygen Isotopes, Radio Astronomy, Absorption Spectra, Abundance, Centimeter Waves, Fractionation

Scientific paper

The 6.8-cm transition of H2C(O-18) has been observed in absorption in the direction of Sgr A, Sgr B2, and W33. The average molecular isotopic abundance ratio, H2(C-13)O/H2C(O-18), for the three sources is 6.9 with no evidence for source-to-source variation. If the oxygen isotopes have the terrestrial abundance and if fractionation in the formation of the formaldehyde isotopic species is not significant, the derived C-12/C-13 carbon isotope ratio would be 72.

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