Nitrogen and oxygen as indicators of primordial enrichment

Details Nitrogen and oxygen as indicators of primordial enrichment Nitrogen and oxygen as indicators of primordial enrichment

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...123....1b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 123, no. 1, June 1983, p. 1-6. Research supported by the Conselho Nacional de

Astronomy and Astrophysics

Astrophysics

45

Cosmochemistry, Galactic Evolution, Nitrogen, Oxygen, Stellar Mass, Stellar Spectra, Abundance, Carbon, Giant Stars, Milky Way Galaxy, Nuclear Fusion

Scientific paper

In this work the nitrogen abundances were derived for eight old Population II stars, and the oxygen abundance was determined for two of these stars. A nitrogen overabundance is found for all stars. The N overabundances in unevolved Population II stars indicate that the early stars were probably more massive than the present ones and a partially primary origin for 14N must be admitted. A massive Population III is also required to explain the oxygen overabundances. One infers two possibilities, viz 500 M_sun; hypernovae or ordinarily massive stars are possible candidates for producing a considerable amount of oxygen and primary nitrogen at early times. In order to have an agreement with the maximum mass of 100 M_sun; (Carlberg, 1981; Jones, 1981), an IMF enhanced in ordinarily massive stars would be necessary. In this case, two variants are still possible: either the first generation of stars consisted of massive stars only, or less massive stars did exist but did not evolve as far as to enrich the interstellar medium until a later period.

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