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Title:
Interstellar C-12/C-13 ratio revisited
Authors:
Crane, Philippe; Hegyi, Dennis J.; Lambert, David L.
Affiliation:
AA(European Southern Observatory, Garching bei München, Germany), AB(Michigan, University, Ann Arbor), AC(Texas, University, Austin)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 378, Sept. 1, 1991, p. 181-185. (ApJ Homepage)
Publication Date:
09/1991
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Carbon 12, Carbon 13, Interstellar Matter, Molecular Ions, Molecular Spectra, Seeing (Astronomy), Telescopes
DOI:
10.1086/170418
Bibliographic Code:
1991ApJ...378..181C

Abstract

Recent 107-in telescope observations of the molecular ion CH(+) at 4232 A in the direction of Zeta Oph are reported. One-dimensional spectra were extracted from the frames using procedures in IRAF. A Gaussian line profile was fitted to the data at random points well separated from the CH(+) features. The resulting distribution of equivalent widths is presented. Results for the individual spectra are summarized as well as the errors assigned to the individual results. Histograms of the equivalent widths for the CH-12(+) and CH-13(+) lines are shown and compared to the data from Stahl at al. (1989), and good agreement is found. It is concluded that the C-12/C-13 ratio toward Zeta Oph is closer to 70 than to 45, as argued by Hawkins et al. (1985).

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