Nitrogen enhancement in metal-poor dwarfs - From inside or outside?

Details Nitrogen enhancement in metal-poor dwarfs - From inside or outside? Nitrogen enhancement in metal-poor dwarfs - From inside or outside?

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987japa....8...93s&link_type=abstract

(IAU, Meeting on Nucleosynthesis in the Galaxy from the Study of Low-mass Stars, New Delhi, India, Nov. 27, 1985) Journal of Ast

Astronomy and Astrophysics

Astrophysics

2

Dwarf Stars, Nitrogen, Stellar Composition, Iron, Lithium, Metallicity

Scientific paper

The five known metal-poor dwarfs with an enhanced N/Fe ratio have been observed spectroscopically. Two of these dwarfs have no lithium line; the absence of lithium is most probably accounted for by the usual convective destruction. The three other dwrfs have the same lithium abundance as the normal metal-poor dwarfs (Spite, Maillard, and Spite, 1984). This excludes the deep mixing process as the general source of nitrogen enhancement, since lithium is destroyed in deep (hot) layers. Deep mixing had been previously found unlikely in metal-poor dwarfs (Da Costa and Demarque, 1982). The discussion stresses the remarkable uniformity of the lithium abundance in metal-poor dwarfs, and shows that the N-rich contaminating matter has a high N/H ratio. Finally, the Al abundance is not greatly enhanced in these five stars.

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