Computer Science
Scientific paper
Sep 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986msngr..45....1c&link_type=abstract
ESO Messenger (ISSN 0722-6691), Sept. 1986, p. 1, 2.
Computer Science
1
Cyano Compounds, Interstellar Matter, Line Spectra, Spectral Line Width
Scientific paper
The molecule (C-13)N has been detected for the first time in the interstellar medium. A plot of a portion of the observed spectrum which contains the newly discovered line is shown. This new line is the R(0) line of the 0,0 band of the B 2 Sigma - X 2 Sigma electronic system of (C-13)N. Its equivalent width is 0.179 + or - 0.040 mA. The new feature allows a determination of the carbon isotope ratio in the interstellar cloud in the direction of Zeta Ophiuchi. The C-12/C-13 ratio determined from these measurements is 50(+13; -10). This can be compared to the terrestrial ratio of 89 and further substantiates theories of the enrichment of C-13 in the interstellar medium through evolution of the Galaxy since the formation of the solar system.
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