用SALT上的RobertStobie摄谱仪测定47个图格里克的CMD中s-和r-过程元素丰度
s- and r-process element abundances in the CMD of 47 Tucanae using the Robert Stobie Spectrograph on SALT
摘要：
Wylie等人在2006年的一项研究表明，在47 Tuccino的红巨星分支和渐近巨星分支恒星中，s过程元素丰度相对于铁都有所增强。一个更详细的调查，s-过程的元素丰度在整个颜色星等图的47 Tuccino是至关重要的，以确定所观察到的增强是否是固有的集群。本文通过观察和理论手段探讨了这种可能性。本文探讨了在47 Tuccenda的色星等图中巨矮星和矮星的合成光谱中s-和r-过程元素线的可见性。它被确定为10 000的分辨率是足够的观察s过程元素丰度变化的球状星团巨型分支星。这些合成结果与在南非大型望远镜上的罗伯特·斯托比摄谱仪性能验证期间观察到的11颗47个图克坦巨星分支星的光谱进行了比较。研究了三种s过程元素Zr、Ba、Nd和一种r过程元素Eu。未发现丰度变化，使得[X/Fe] = 0.0 +/- 0.5 dex。得出的结论是，这个分辨率，R ~ 5000，是不足以获得准确的丰度，但上限的s-过程元素丰度可以确定。
英文摘要：
A recent study by Wylie et al 2006 has revealed that s-process element abundances are enhanced relative to iron in both red giant branch and asymptotic giant branch stars of 47 Tucanae. A more detailed investigation into s-process element abundances throughout the colour-magnitude diagram of 47 Tucanae is vital in order to determine whether the observed enhancements are intrinsic to the cluster. This paper explores this possibility through observational and theoretical means. The visibility of s- and r-process element lines in synthetic spectra of giant and dwarf stars throughout the colour magnitude diagram of 47 Tucanae has been explored. It was determined that a resolving power of 10 000 was sufficient to observe s-process element abundance variations in globular cluster giant branch stars. These synthetic results were compared with the spectra of eleven 47 Tucanae giant branch stars observed during the performance verification of the Robert Stobie Spectrograph on the Southern African Large Telescope. Three s-process elements, Zr, Ba, Nd, and one r-process element, Eu, were investigated. No abundance variations were found such that [X/Fe] = 0.0 +/- 0.5 dex. It was concluded that this resolving power, R ~ 5000, was not sufficient to obtain exact abundances but upper limits on the s-process element abundances could be determined.
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