The C-12/C-13 isotope ratio toward Zeta Ophiuchi

Details The C-12/C-13 isotope ratio toward Zeta Ophiuchi The C-12/C-13 isotope ratio toward Zeta Ophiuchi

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...294l.131h&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 294, July 15, 1985, p. L131-L135. NASA-NSF-supporte

Astronomy and Astrophysics

Astrophysics

35

Abundance, Interstellar Matter, Molecular Clouds, Ophiuchi Clouds, Carbon 12, Carbon 13, Line Spectra, Spectral Line Width

Scientific paper

Observations of interstellar CH(+) toward Zeta Oph were performed to determine the C-12/C-13 isotope ratio in this diffuse cloud. The very high signal-to-noise ratio spectra yield 6 sigma detections of the (C-13)H(+) features at 4232 A and 3957 A; a weighted mean C-12/C-13 ratio of 43 + or - 6 (1 sigma) is obtained. The uncertainty includes the contribution of continuum placement errors, statistical channel-to-channel signal fluctuations, and the error introduced in deconvolving the blended isotopic lines at 4232 A. This result indicates a decrease in the local galactic C-12/C-13 ratio by a factor of 2 during the 4.6 billion yr since the formation of the sun.

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