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.
The nature of the First Stars: the role of the isotopic ratios of barium
Cescutti G;
2015-01-01
Abstract
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.Pubblicazioni consigliate
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