Wednesday, October 24, 2012

1210.6211 (S. M. Andrievsky et al.)

Barium Abundances in Cepheids    [PDF]

S. M. Andrievsky, J. R. D. Lepine, S. A. Korotin, R. E. Luck, V. V. Kovtyukh, W. J. Maciel
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.
View original: http://arxiv.org/abs/1210.6211

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