| Texto completo | |
| Autor(es): |
Smiljanic, Rodolfo
;
Pasquini, L.
;
Bonifacio, P.
;
Galli, D.
;
Barbuy, B.
;
Gratton, R.
;
Randich, S.
;
Cunha, K
;
Spite, M
;
Barbuy, B
Número total de Autores: 10
|
| Tipo de documento: | Artigo Científico |
| Fonte: | COSMIC MAGNETIC FIELDS: FROM PLANETS, TO STARS AND GALAXIES; v. N/A, n. 265, p. 2-pg., 2010-01-01. |
| Resumo | |
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. (AU) | |
| Processo FAPESP: | 04/13667-4 - Bandas moleculares e índices espectrais na região ultravioleta 3200-4500a |
| Beneficiário: | Rodolfo Henrique Silva Smiljanic |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |
| Processo FAPESP: | 08/55923-8 - Abundancias de oxigenio e a formacao do halo e do disco espesso |
| Beneficiário: | Rodolfo Henrique Silva Smiljanic |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |