Dilution Masses and the Iron Abundances of Second-Generation Stars Enriched by a Single Event

The iron abundance of a star enriched by exactly one earlier supernova is set less by the explosion than by how much clean gas its metals were stirred into. This study computes the relevant quantities from stated assumptions and compares them with published values. The headline results are: Fe yield Msun = 0.07; [Fe/H] at 1e4 Msun = -2.29; [Fe/H] at 1e5 Msun = -3.29; dilution for [Fe/H] minus5 Msun = 5.11e+06; observed floor [Fe/H] = -7.3. Dilution into ten thousand solar masses gives iron near one hundredth of solar; dilution into one hundred thousand gives near one thousandth. The study is simulated and computed, not measured, and its negative findings, where the computation does not support an effect, are reported at the same prominence as its positive ones.