Physics – Nuclear Physics
Scientific paper
Feb 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aipc..425..581s&link_type=abstract
Tours symposium on nuclear physics III. AIP Conference Proceedings, Volume 425, pp. 581-591 (1998).
Physics
Nuclear Physics
2
Atomic, Molecular, And Chemical, And Grain Processes
Scientific paper
By means of galactic chemical evolution models we analyze the consequences of different upgraded stellar yields on the gradients along the Galactic Disk of 14N, 16O and of the main isotopic ratios (12C/13C, 14N/15N, 16O/17O, 16O/18O, 18O/17O). The evolution in the solar neighborhood of the same ratios is also examined. The best results are obtained by using solar composition yields during the whole galactic evolution, which provide a good fit to the data for the current gradient and the evolution except for 18O/17O. On the contrary, by using metallicity dependent yields, we don't reproduce satisfactorily the 12C/13C gradient and the time behaviour of all the isotopic ratios. Altering some of the basic assumption of the galactic model doesn't change this result. A simple algorithm to mimic the time delayed contribution of novae to the interstellar enrichment of 15N is introduced, leading to a significant improvement of the comparison with the observed nitrogen isotopic ratio. Hints to stellar nucleosynthesis can be traced from these results.
Sandrelli Stefano
Tosi Mia
Visco Anthony
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