A view of the Galactic halo using beryllium as a time scale

Details A view of the Galactic halo using beryllium as a time scale A view of the Galactic halo using beryllium as a time scale

2009-09-14

arxiv.org/abs/0909.2635v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

To appear in Proceedings of the International Astronomical Union, IAU Symposium, Volume 265, Chemical abundances in the Univer

Scientific paper

Beryllium stellar abundances were suggested to be a good tracer of time in the early Galaxy. In an investigation of its use as a cosmochronometer, using a large sample of local halo and thick-disk dwarfs, evidence was found that in a log(Be/H) vs. [alpha/Fe] diagram the halo stars separate into two components. One is consistent with predictions of evolutionary models while the other is chemically indistinguishable from the thick-disk stars. This is interpreted as a difference in the star formation history of the two components and suggests that the local halo is not a single uniform population where a clear age-metallicity relation can be defined.

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