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- W2013133934 abstract "view Abstract Citations (198) References (48) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS 12C/ 13C Isotope Ratio in the Local Interstellar Medium from Observations of 13C 18O in Molecular Clouds Langer, William D. ; Penzias, Arno A. Abstract The paper examines the (C-12)/(C-13) isotope ratio in the solar neighborhood on the basis of observations of the (C-12)(O-18) and (C-13)(O-18) J = 1-0 transitions in four interstellar clouds located within 500 pc. The (C-12)/(C-13) ratio in these sources ranges from 57 to 74, and its weighted average is 62 +/- 4, with thermal noise and line formation uncertainties contributing about equally to the probable error. These values indicate moderate chemical evolution in the local star neighborhood since the formation of the solar system, in good agreement with model prediction of the current carbon ratio in the local interstellar medium. Publication: The Astrophysical Journal Pub Date: May 1993 DOI: 10.1086/172611 Bibcode: 1993ApJ...408..539L Keywords: Abundance; Carbon Monoxide; Carbon 12; Carbon 13; Interstellar Matter; Milky Way Galaxy; Molecular Clouds; Solar Neighborhood; Cyanogen; Dark Matter; H Ii Regions; Opacity; Oxygen 18; Radiation Absorption; Astrophysics; ISM: ABUNDANCES; ISM: CLOUDS; ISM: MOLECULES full text sources ADS | data products SIMBAD (9)" @default.
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- W2013133934 title "(C-12)/(C-13) isotope ratio in the local interstellar medium from observations of (C-13)(O-18) in molecular clouds" @default.
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