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Recent determinations of the upper mass limit to the local initial massfunction (IMF) claim a value of m(upper)=50+/-10 solar masses, based upondirect comparisons of the observed oxygen and iron abundances in metal-poorstars with the predicted stellar yields from Type II supernovae (SNe). Anunappreciated uncertainty in these analyses is the input physics intrinsic toeach SNe grid, and its effect upon stellar nucleosynthesis. We demonstrate howsuch uncertainties, coupled with the uncertain metal-poor halo starnormalization, while allowing us to set a lower bound to m(upper) ofapproximately 40 solar masses, nullifies any attempt at constraining the upperbound.

Can Stellar Yields Accurately Constrain the Upper Limit to the Initial Mass Function?