2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/3417Halo initial mass functions (IMFs) heavily biased toward white dwarf (WD) precursors ~1-8 Msun have been suggested as a suitable mechanism for explaining MACHO events. However, by simple chemical evolution argument, Gibson & Mould (1997; GM97) pointed out that such WD-heavy IMFs (wdIMF) cause the overproduction of carbon and nitrogen. We re-examine this problem using numerical simulations.2 pages, 1 table, to appear in the proceedings of IAU Symp. 208, "Astrophysical Supercomputing Using Particles", eds. J. Makino & P. HutAstrophysicstext