The C-12/C-13 abundance ratio in NGC 2264

Details The C-12/C-13 abundance ratio in NGC 2264 The C-12/C-13 abundance ratio in NGC 2264

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...404l..79m&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 404, no. 2, p. L79-L82.

Physics

Optics

8

Abundance, Carbon Isotopes, Infrared Absorption, Interstellar Gas, Molecular Clouds, Carbon Monoxide, Cassegrain Optics, Fourier Transformation, Spectrometers

Scientific paper

A novel method of obtaining the C-12/C-13 ratio in molecular clouds consists of combining fundamental band measurements of (C-13)O with first-overtone band measurements of (C-12)O. Advantages of this infrared absorption technique are described, and a result for NGC 2264 is presented. A high-resolution (6.9 km/s) M band (4.7 microns) spectrum of the source NGC 2264 IRS (= AFGL 989), obtained at the CFHT, shows v = 0-1 absorption lines due to (C-13)O. A curve-of-growth analysis was carried out to obtain the (C-13)O column density. Our (C-13)O column density, when combined with the (C-12)O column density of Black et al. (1990), yields the isotopic abundance ratio (C-12)O/(C-13)O = 94 +/- 13 (1 sigma). The ratio for NGC 2264 is consistent with the solar ratio and is significantly larger than the (C-12)(O-18)/(C-13)(O-18) abundance ratio found by Langer and Penzias (1990) using radio emission lines.

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