NGC 456 and the Universe's Underestimated Metallicity

We want to recalibrate the log(O_{23}) vs. 12+log(O/H) diagram for low metallicity objects in the presence of temperature inhomogeneities, t^2. The first object of our study is NGC 456; we find that the point corresponding to NGC 456 in such diagram shifts up by 0.24 dex in the 12+log(O/H) axis. This shift along with the same behavior in other objects, implies that abundances in the Universe need to be corrected by a factor of approximately 2.