Ciao？再见了！
Ciao? Adios!
摘要：
在“球状星团天文学新视野”会议上（帕多瓦，2002年6月），VLT球状星团小组的两名成员对星族II恒星中重元素沉积的重要性提出了不同的观点：“由于缺乏球状星团亚巨星大气中Fe和Li耗尽的证据，一些人怀疑，由于未知的原因，星族II恒星不受这种机制的影响。（Castellani，2003年）和“应该有某种防止沉积的机制。（Gratton 2003）。在这篇评论中，我认为这两种说法背后的怀疑是有道理的。最近，我们使用更高质量的VLT/FLAMES-UVES数据（Korn et al. 2006，2007）重新审视了Gratton et al.（2001）提出的NGC 6397恒星的沉积结果。元素特定的丰度趋势，同意原子扩散的预测，如果对流信封下面的湍流混合是占在一个参数化的方式。因此，我们是否检测到了老恒星中原子扩散（ADIOS）的特征？或者这些趋势仅仅是天文观测中的阴谋不准确（CIAO）的人工制品？
英文摘要：
At the "New Horizons in Globular Cluster Astronomy" conference (Padova, June 2002), two members of the VLT globular cluster team presented different views on the importance of heavy-element sedimentation in Population II stars: "The lack of evidence for depletion of Fe and Li in the atmospheres of globular cluster subgiants led some people to suspect that, for unknown reasons, Population II stars are not affected by this mechanism." (Castellani 2003) and "There should be some mechanism that prevents sedimentation." (Gratton 2003). In this review, I will argue that the scepticism behind both these statements is justified. We recently revisited the results on sedimentation in NGC 6397 stars presented by Gratton et al. (2001) using higher-quality VLT/FLAMES-UVES data (Korn et al. 2006, 2007). Element-specific abundance trends were identified which agree with atomic-diffusion predictions, if turbulent mixing below the convective envelope is accounted for in a parametrized way. Have we thus detected signatures of Atomic Diffusion in Old Stars (ADiOS)? Or are these trends mere artefacts of Conspiring Inaccuracies in Abundance Observations (CIAO)?
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