Yields from the Primordial Stars

Physics

Scientific paper

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Scientific paper

The first stars were formed from matter fresh from the Big Bang, and the evidence of their nucleosynthesis should be evident in extremely metal-poor Population II stars. Estimates of these yields are sensitive to poorly understood features of convective mixing. The yields from H to Ni from a primordial star of 25 M_sun are discussed. The effective helium core is significantly smaller than in Population I stars. Significant amounts of primary nitrogen may be produced. The ratio of helium to ``metal'' production is relatively high, dY/dZ ~ 3.4. A significant neutron excess develops during hydrostatic carbon burning which places lower limits of the ratios of Na/Mg and Al/Mg, as well as for heavier odd-Z/even-Z pairs. Li and (3He) are produced, but weakly.

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