Isotopic species of HCO+ in giant molecular clouds

Details Isotopic species of HCO+ in giant molecular clouds Isotopic species of HCO+ in giant molecular clouds

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...245...99s&link_type=abstract

Astrophysical Journal, Part 1, vol. 245, Apr. 1, 1981, p. 99-104.

Astronomy and Astrophysics

Astrophysics

14

Abundance, Astronomical Spectroscopy, Hydrocarbons, Isotopes, Molecular Clouds, Oxygen Compounds, Carbon Isotopes, Carbon Monoxide, Formic Acid, Free Radicals, Interstellar Matter, Line Spectra, Oxygen Isotopes, Tables (Data)

Scientific paper

The relative abundance of 12C and 13C in giant molecular clouds is studied through observations of the J = 1 → 0 transitions of HCO+ ,H13CO+, and HC18O+. HCO+ is produced from CO and should exhibit isotopic abundances similar to CO, but it has different radiative properties. The lines observed arise in dense, warm (T ∼ 30 K) cores of giant molecular clouds and are less saturated than CO lines. The 12C/13C isotope ratios observed are in general agreement with those found in CO by Wannier et al.: 60 in the galactic disk, 40 in Orion A, and 20 in the galactic center.

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