论文标题
球形光谱仪的球状簇的关闭恒星中的铍丰度
Beryllium abundances in turn-off stars of globular clusters with the CUBES spectrograph
论文作者
论文摘要
球状簇构成了多个恒星种群，这些恒星群显示出受热氢燃烧影响的光元素的星到明星变化（例如He，C，N，O）。已经提出了几种情况来解释这些变化。大多数涉及多个恒星形成发作，后来的几代是由先前恒星产生的核合成产物污染的物质诞生的。这种情况建模的一个困难是知道混合和原始材料混合在一起的程度。在这种情况下，在不同世代的转弯恒星中测得的铍丰度可以提供新的信息。铍起源于宇宙射线散布，只能在恒星内部销毁。因此，铍丰度可以直接测量在球状簇中形成恒星的材料的污染程度。但是，球状簇中的关闭恒星微弱，此类研究超出了当前仪器的能力。在这项工作中，我们展示了立方体光谱仪将带来该区域的进展。我们的模拟表明，立方体将在不同世代的恒星之间的be频率中检测到约0.6 dex的变化，在附近的几个球状簇中，其关闭幅度降至$ v $ = 18 mag。
Globular clusters host multiple stellar populations that display star-to-star variation of light elements that are affected by hot hydrogen burning (e.g., He, C, N, O). Several scenarios have been suggested to explain these variations. Most involve multiple star formation episodes, where later generations are born from material contaminated by the nucleosynthetic products of the previous stellar generation(s). One difficulty in the modelling of such scenarios is knowing the extent to which processed and pristine material are mixed. In this context, beryllium abundances measured in turn-off stars of different generations can provide new information. Beryllium originates from cosmic-ray spallation and can only be destroyed inside stars. Beryllium abundances can thus directly measure the degree of pollution of the material that formed stars in globular clusters. Turn-off stars in globular clusters are however faint and such studies are beyond the capabilities of current instrumentation. In this work, we show the progress that the CUBES spectrograph will bring to this area. Our simulations indicate that CUBES will enable the detection of variations of about 0.6 dex in the Be abundances between stars from different generations, in several nearby globular clusters with turn-off magnitude down to $V$ = 18 mag.
