Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...559l.163b&link_type=abstract
The Astrophysical Journal, Volume 559, Issue 2, pp. L163-L166.
Astronomy and Astrophysics
Astronomy
16
Ism: Molecules, Line: Identification, Methods: Laboratory, Molecular Data
Scientific paper
The pure rotational spectra of two metal carbide species, NiC (X1Σ+) and CoC (X2Σ+), have been measured in the laboratory using millimeter/submillimeter direct absorption methods. The molecules were created by reacting metal vapor with CH4 in a DC discharge. Four rotational transitions of CoC were recorded, each consisting of 16 hyperfine components arising from the cobalt nuclear spin of I=7/2. Multiple transitions of the two most abundant nickel isotopomers, 58NiC and 60NiC, were additionally measured. The spectra were analyzed using the appropriate Hamiltonian and spectroscopic constants accurately determined. For CoC, this study included a complex hyperfine analysis of the magnetic, electric quadrupole, and nuclear spin-rotation terms. Cobalt and nickel are iron peak elements that may be produced via neutron capture processes in asymptotic giant branch stars. Dredge-up events mix these elements to the stellar surface, where they are incorporated into the expanding stellar envelope. CoC and NiC offer a means to trace these elements in carbon-rich circumstellar shells.
Brewster Matthew A.
Ziurys Lucy M.
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