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Beryllium abundances and the formation of the halo and the thick disk
| Content Provider | Scilit |
|---|---|
| Author | Smiljanic, Rodolfo Pasquini, L. Bonifacio, P. Galli, D. Barbuy, B. Gratton, R. Randich, S. |
| Copyright Year | 2009 |
| Description | The single stable isotope of beryllium is a pure product of cosmic-ray spallation in the ISM. Assuming that the cosmic-rays are globally transported across the Galaxy, the beryllium production should be a widespread process and its abundance should be roughly homogeneous in the early-Galaxy at a given time. Thus, it could be useful as a tracer of time. In an investigation of the use of Be as a cosmochronometer and of its evolution in the Galaxy, we found evidence that in a log(Be/H) vs. [α/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. We also found evidence that the star formation rate was lower in the outer regions of the thick disk, pointing towards an inside-out formation. |
| Related Links | http://arxiv.org/abs/1001.1834 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/3D571E7B7BDEF73A28543485805A530C/S1743921310004667a.pdf/div-class-title-beryllium-abundances-and-the-formation-of-the-halo-and-the-thick-disk-div.pdf |
| Ending Page | 488 |
| Page Count | 6 |
| Starting Page | 483 |
| ISSN | 17439213 |
| e-ISSN | 17439221 |
| DOI | 10.1017/s1743921310004667 |
| Journal | Proceedings of the International Astronomical Union |
| Issue Number | S268 |
| Volume Number | 5 |
| Language | English |
| Publisher | Cambridge University Press (CUP) |
| Publisher Date | 2009-11-01 |
| Access Restriction | Open |
| Subject Keyword | Proceedings of the International Astronomical Union Astronomy and Astrophysics Abundances type – Galaxy Thick Disk |
| Content Type | Text |
| Resource Type | Article |
| Subject | Astronomy and Astrophysics Space and Planetary Science |
