Isotopic Abundances of Carbon and Oxygen and Fractionation in Interstellar Carbon Monoxide

Details Isotopic Abundances of Carbon and Oxygen and Fractionation in Interstellar Carbon Monoxide Isotopic Abundances of Carbon and Oxygen and Fractionation in Interstellar Carbon Monoxide

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991hst..prop.1065l&link_type=abstract

HST Proposal ID #1065

Physics

Hst Proposal Id #1065

Scientific paper

HRS observations of the CO A-X system between 1250 and 1550 A will be acquired and analyzed to obtain abundances of 12C16O, 13C16O, 12C17O, and 12C18O, and to study the rotational excitation of the CO molecule. Additional observations of the weak inter-combination line of C II at 2324 A have provided the C+ abundance which plays an important role in chemical fractionation. Diffuse interstellar gas towards local stars (e.g. Zeta Oph) will be observed lines of the less abundant isotopic species of CO. A check on the Galactic gradient in the 12C/13C ratio will be attempted by observing stars about 1 kpc towards and away from the Galactic center.

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