Nitrogen overabundances in Population II dwarfs

Details Nitrogen overabundances in Population II dwarfs Nitrogen overabundances in Population II dwarfs

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...263l..29b&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 263, Dec. 1, 1982, p. L29-L33.

Astronomy and Astrophysics

Astrophysics

59

Cosmochemistry, Dwarf Stars, Nitrogen, Nuclear Fusion, Abundance, Iron, Spectrum Analysis, Stellar Mass

Scientific paper

From a survey and spectrum synthesis analysis of the NH features in the spectra of some 25 Population II dwarfs, two objects have been found in which nitrogen is overabundant relative to the heavy elements by a factor of about 50-100 (i.e., N/Fe approximately equal to 1.7-2.0). The two stars are HD 74000 and HD 160617, which are well-known, extremely metal-deficient subdwarfs with Fe/H of about -2.0. Unless one is willing to invoke mixing during the main-sequence phase, or nitrogen-enhanced mass transfer in a binary system (both of which are believed to be unlikely explanations), the available data suggest a decoupling of nitrogen and heavy element production during the first stellar generations, and indicate that, in the early universe, nitrogen was produced as a primary element.

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