In the last years our group has found that many chemical anomalies
observed in very metal-poor halo stars suggest the First Stars were fast
rotators (spinstars). Recently, theoretical computations have found that
spinstars can also play a role in the chemical enrichment of neutron
capture elements providing a early contribution of s-process. By means
of a stochastic chemical evolution model, it is possible to identify the
spinstars s-process contribution as the missing component responsible
for the spread in the ratio between light (Sr) to heavy (Ba) neutron
capture elements. A specific distribution is predicted for the isotopic
ratio of Ba in halo stars and this imprint can be the smoking gun of the
existence of spinstars in the Early Universe.
