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

Bibcode
1991A&A...251..245C
Centurion, Miriam; Vladilo, Giovanni
Bibliographical reference

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

Advertised on:
11
1991
Number of authors
2
IAC number of authors
1
Citations
18
Refereed citations
16
Description
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.
Type
Refereed
Solar neighborhood

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