Observations of N-14/N-15 in the galactic disk

Details Observations of N-14/N-15 in the galactic disk Observations of N-14/N-15 in the galactic disk

Jul 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...247..522w&link_type=abstract

Astrophysical Journal, Part 1, vol. 247, July 15, 1981, p. 522-529.

Astronomy and Astrophysics

Astrophysics

41

Abundance, Galactic Evolution, Interstellar Matter, Molecular Clouds, Nitrogen Isotopes, Nuclear Fusion, Carbon 12, Carbon 13, Emission Spectra, Nitrogen 15, Novae, Stellar Envelopes, Stellar Evolution

Scientific paper

A survey is made of HCN-15 and H(C-13)N including 16 giant molecular clouds and a circumstellar cloud of expelled material. There is evidence for an evolutionary decrease of the double ratio (N-15/N-14) x (C-12/C-13) and for the two single isotopes independently. The detection of HCN-15 in IRC + 10216 indicates the dilution of CN cycled material in the expelled envelope, and the lack of radial N or C isotope gradient in the outer Galaxy contrasts to the observed N/H chemical abundance gradient. This observed behavior and the circumstellar abundances are best explained in terms of galactic enrichment models where N-15 is produced by explosive CN burning of hydrogen in novae, and in N-14 by equilibrium processing in stars.

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