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(C-12)/(C-13) isotope ratio in the local interstellar medium from observations of (C-13)(O-18) in molecular cloudsThe 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.
Document ID
19930052398
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Langer, William D.
(JPL, Pasadena, CA; AT&T Bell Labs. Murray Hill, NJ, United States)
Penzias, Arno A.
(AT&T Bell Labs. Murray Hill, NJ, United States)
Date Acquired
August 16, 2013
Publication Date
May 10, 1993
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 408
Issue: 2
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
93A36395
Distribution Limits
Public
Copyright
Other

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