Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...295..194d&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 295, no. 1, p. 194-198
Astronomy and Astrophysics
Astrophysics
33
Abundance, Galactic Evolution, Massive Stars, Nitrogen Isotopes, Regression Analysis, Emission Spectra, Interstellar Matter, Line Spectra, Mathematical Models, Molecular Clouds, Time Lag
Scientific paper
We present high quality data of HCN double isotopomer ratios observed in the J = 1-0 line of 11 warm, dense molecular clouds in the galactic disk. After fitting C-12/C-13 ratios from published data as a function of galactocentric distance, we obtained the N-14/N-15 ratios. From these results and previously published data, we have determined the galactic disk gradient of the nitrogen isotope ratio using a linear regression. We have obtained a gradient of 19.7 +/- 8.9/kpc. We have compared our result with the theoretical model of Matteucci & D'Antona (1991) and conclude that N-15 is a purely secondary element; N-14 must also be secondary, but with a significant primary contribution. We briefly discuss the production of nitrogen isotopes involving massive stars; however, it may be difficult to fit the C-12/C-13 gradient into this scenario.
Dahmen G.
Matteucci Francesca
Wilson Thomas L.
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