Redetermination of the interstellar C-12/C-13 ratio in the solar vicinity

Details Redetermination of the interstellar C-12/C-13 ratio in the solar vicinity Redetermination of the interstellar C-12/C-13 ratio in the solar vicinity

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...251..245c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 251, no. 1, Nov. 1991, p. 245-252.

Astronomy and Astrophysics

Astrophysics

18

Carbon 12, Carbon 13, Interstellar Matter, Solar Neighborhood, Visible Spectrum, Absorption Spectra, Interstellar Gas, Methyl Compounds, Molecular Ions, Stellar Spectra

Scientific paper

An analysis of 50 optical spectra of the interstellar methylidyne ion in the direction of HD26676 and HD149038 derived very similar interstellar isotopic ratios for the two lines-of-sight. A lack of a Galactic gradient in isotopic ratios is noted which is consistent with the location in the solar vicinity of the gas in front of HD149038. The results obtained support a modest decrease of the interstellar C-12/C-13 ratio since the time of the sun's formation, rather than the factor-of-2 decrease which is often encountered in the literature.

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