Barium abundances in Cepheids
Barium abundances in Cepheids
复制标题
造父变星中的钡丰度
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
W. J. Maciel
中科院分区：
文献类型：
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作者：
S. Andrievsky;J. Lépine;S. Korotin;R. E. Luck;V. Kovtyukh;W. J. Maciel
我们得出了由 270 颗恒星组成的大型造父变星样本的大气中钡丰度。该样本覆盖了较大范围的银心距离，从大约4到15 kpc，因此适合研究银盘中径向钡丰度梯度的存在。事实上，这是第一次对银盘中的钡丰度分布进行如此全面的分析。因此，我们得出结论，Ba 丰度分布可以用零梯度来表征。该结果与其他元素的导出梯度进行了比较，并简要讨论了钡丰度与银心距离无关的一些原因。
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 it is appropriate 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 has been 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 from Galactocentric distances.