Superbubble Hii regions: how self-enriched should they be?

I modeled the pollution of low metallicity (Z = 0.001) superbubble H ii regions with the ejecta from single stellar populations of 104 −106 M_ in mass. I found that the He, C, N, and O abundance enhancements in the H ii regions, due to pollution with the enriched winds from Wolf-Rayet stars, are insignificant at 5Myr. The few localized metal enhancements observed so far in resolved extragalactic H ii regions are not associated with superbubbles and remain to be modeled in detail.