Physics
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...158...60d&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 158, no. 1-2, April 1986, p. 60-66.
Physics
35
Chemical Evolution, Cosmochemistry, Nitrogen, Nuclear Fusion, Spiral Galaxies, Abundance, Milky Way Galaxy, Oxygen, Stellar Physics
Scientific paper
Numerical models of chemical evolution reproducing the observed oxygen abundances through the discs of the Galaxy and eight nearby spirals have been computed to predict their corresponding nitrogen abundances under different assumptions on the stellar nucleosynthesis involved in the computation of the yields. It is found that a primary fraction of nitrogen between 30 and 60% (corresponding to a mixing length 1.0 ≤ αRV ≤ 1.5) is required in order to reproduce simultaneously the observed oxygen and nitrogen abundances. The best agreement between model results and observational data is attained for αRV closer to 1.5 and an upper limit for intermediate mass stars of Mup ≅ 5 - 6 M_sun; instead of the standard 8 M_sun;. This combination of stellar evolution parameters is also required to reproduce the 12C/13C isotopic ratio observed in galactic molecular clouds and the N/C vs. C/H distribution derived from stellar observations in the solar neighbourhood.
Diaz Angeles I.
Tosi Mia
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