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Communication Dans Un Congrès Année : 2009

Halo chemistry and first stars. The chemical composition of the matter in the early Galaxy, from C to Mg†

Résumé

From NLTE computations of the magnesium abundance in a sample of extremely metal-poor giants we derive [Mg/Fe]= 0.7, leading to [Al/Mg]=-0.80 and [Na/Mg]=-0.85 in the early Galaxy. The ratio [O/Mg] should be near to the solar value. Measurements of nitrogen abundances derived from the analysis of the NH band in eight more stars confirm the large scatter of the ratios [N/Fe] and [N/O] in the early Galaxy.

Dates et versions

hal-03743725 , version 1 (02-08-2022)

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Monique Spite, Piercarlo Bonifacio, Roger Cayrel, François Spite, Patrick François, et al.. Halo chemistry and first stars. The chemical composition of the matter in the early Galaxy, from C to Mg†. The Galaxy Disk in Cosmological Context, IAU Symposium 254, Jun 2008, Copenhagen, Denmark, Denmark. pp.349-354, ⟨10.1017/S1743921308027804⟩. ⟨hal-03743725⟩
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