Isotopic fractionation and mass motion in giant molecular clouds

Details Isotopic fractionation and mass motion in giant molecular clouds Isotopic fractionation and mass motion in giant molecular clouds

Oct 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...273..195p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 273, Oct. 1, 1983, p. 195-201.

Astronomy and Astrophysics

Astrophysics

25

Abundance, Astronomical Spectroscopy, Carbon Isotopes, Interstellar Chemistry, Molecular Clouds, Carbon Monoxide, Chemical Fractionation, Milky Way Galaxy, Molecular Rotation, Rotational Spectra

Scientific paper

Millimeter-wave rotation spectra of the 12C16O, 13C16O, and 12C18O isotopes of carbon monoxide were mapped in two giant molecular clouds in the Galaxy, NGC 2264 and W3(OH). The data were used to derive 13C16O/12C18O abundance ratios as a function of velocity, as well as position, in these sources. These observations show that carbon-13 isotopic abundance determinations are more subject to chemical enhancement effects than had been previously realized. There is a suggestive association between velocity wings and cloud edges, which fits predictions of cloud evolution models involving large-scale radial motion. Measurements of the rare 13C18O species were also made in these two clouds and a new interstellar 12C/13C abundance (100±14) was derived.

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