Observations of the C-12/C-13 ratio in four galactic sources of formaldehyde

Details Observations of the C-12/C-13 ratio in four galactic sources of formaldehyde Observations of the C-12/C-13 ratio in four galactic sources of formaldehyde

May 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...206l..63m&link_type=abstract

Astrophysical Journal, vol. 206, May 15, 1976, pt. 2, p. L63-L66.

Astronomy and Astrophysics

Astrophysics

12

Absorption Spectra, Carbon Isotopes, Formaldehyde, Interstellar Matter, Carbon 12, Carbon 13, Hydrogen Recombinations, Hyperfine Structure

Scientific paper

Observations of the 6-cm absorption lines of H2(C-12)O and H2(C-13)O have yielded values for the abundance ratio of C-12 to C-13 of 62 in W3, 55 in NGC 2024, and lower limits for this ratio that are close to terrestrial in Cas A and M17. This provides additional evidence for substantial variation of the C-12/C-13 abundance ratio in interstellar matter. The H141-beta recombination line of hydrogen has also been observed in these sources, and several previously unknown sources of formaldehyde absorption have been found.

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