Emission rates of ionizing photons from a starburst of 10⁶ M_⊙ as a function of time. We show the emission rates from stripped stars in dark blue, from massive stars in light blue (using STARBURST99), and we also show the predicted emission rates from the code BPASS in gray. The shaded regions span the emission rates for metallicities between Z = 0.0002 and Z = 0.014, and the solid lines show the emission rates for solar metallicity (Z = 0.014). Top panel: emission rate of H I-ionizing photons, and bottom panel: emission rate of He II-ionizing photons. Stripped stars are clearly responsible for late emission of ionizing photons in a starburst. This figure is adapted from Paper III.