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Interstellar nitrogen isotope ratios

Published online by Cambridge University Press:  04 August 2017

R. Güsten  and
H. Ungerechts
R. Güsten
Affiliation:
Max-Planck-Institut für Radioastronomie, Bonn
H. Ungerechts
Affiliation:
I. Physikalisches Institut der Universität Köln

Extract

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We report first results of a systematic study of the galactic interstellar nitrogen isotope ratios, based upon measurements of the (J,K) = (1,1) and (2,2) lines of the 14NH3 and 15NH3 molecules. We find significant deviations of the [14N]/[15N3] abundance ratio from the solar-system value (~270), with the most extreme enrichment in the galactic-center region, where [14N]/[15N] ~ 1500. This value is consistent with a nitrogen nuclear-synthesis scheme in which 14N is the main product of normal secondary CNO-burning, whereas 15N is depleted by the same process.

Type
PART III: Dynamics and Evolution
Information
Symposium - International Astronomical Union , Volume 106: The Milky Way Galaxy , 1985 , pp. 585 - 586
Copyright
Copyright © Reidel 1985 

References

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