We investigate the effect of new stellar models taking rotation into account and computed for a metallicity Z = 10 ^ { -8 } on the chemical evolution of the earliest phases of the Milky Way .
These models were computed under the assumption that the ratio of the initial rotation velocity to the critical velocity of stars is roughly constant with metallicity .
This naturally leads to faster rotation at lower metallicity , as metal-poor stars are more compact than metal-rich ones .
We find that the new Z = 10 ^ { -8 } stellar yields have a tremendous impact on the nitrogen enrichment of the interstellar medium for log ( O/H ) +12 < 7 ( or [ Fe/H ] < - 3 ) .
We show that upon the inclusion of the Z = 10 ^ { -8 } stellar yields in chemical evolution models , both high N/O and C/O ratios are obtained in the very-metal poor metallicity range , in agreement with observations .
Our results give further support to the idea that stars at very low metallicities could have rotational velocities of the order of 600-800 km s ^ { -1 } .