A view of the Galactic halo using beryllium as a time scale - Astrophysics > Astrophysics of GalaxiesReport as inadecuate




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Abstract: Beryllium stellar abundances were suggested to be a good tracer of time inthe early Galaxy. In an investigation of its use as a cosmochronometer, using alarge sample of local halo and thick-disk dwarfs, evidence was found that in alogBe-H vs. alpha-Fe diagram the halo stars separate into two components.One is consistent with predictions of evolutionary models while the other ischemically indistinguishable from the thick-disk stars. This is interpreted asa difference in the star formation history of the two components and suggeststhat the local halo is not a single uniform population where a clearage-metallicity relation can be defined.



Author: Rodolfo Smiljanic, L. Pasquini, P. Bonifacio, D. Galli, B. Barbuy, R. Gratton, S. Randich

Source: https://arxiv.org/







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