| Autor: |
Andrievsky, S. M., Lepine, J. R. D., Korotin, S. A., Luck, R. E., Kovtyukh, V. V., Maciel, W. J. |
| Rok vydání: |
2012 |
| Předmět: |
|
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1093/mnras/sts270 |
| Popis: |
We derived the barium atmospheric abundances for a large sample of Cepheids, comprising 270 stars. The sample covers a large range of galactocentric distances, from about 4 to 15 kpc, so that it is appropriated to investigate the existence of radial barium abundance gradients in the galactic disc. In fact, this is the first time that such a comprehensive analysis of the distribution of barium abundances in the galactic disc is carried out. As a result, we conclude that the Ba abundance distribution can be characterized by a zero gradient. This result is compared with derived gradients for other elements, and some reasons are briefly discussed for the independence of the barium abundances upon galactocentric distances. |
| Databáze: |
arXiv |
| Externí odkaz: |
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