论文标题
锂在我们银河系的最接近的卫星中
Lithium in the closest satellite of our Milky Way
论文作者
论文摘要
最近，我们研究了锂在银河系的薄盘中的化学演化。我们发现，考虑到Novae作为锂的主要来源，获得了与观察到的薄圆盘中观察到的丰度的最佳一致性。我们假设NOVA生产的延迟时间为〜1 GYR，在整个Nova寿命中，有效的7LI收益率为1.8（$ \ pm $ 0.6）x10 $^{ - 5} $ msun。检查我们对银河系的卫星等其他恒星系统上锂生产的详细假设的可能性严重阻碍了它们与我们的距离。在这些系统中，矮星（可以测量原始锂）太微弱，无法检测到锂线。然而，由于盖亚任务，最近有可能在银河系子（称为田野或银河香肠）中解散破坏矮星系的星星。采用调节的化学演化模型以匹配Exceladus恒星的金属性分布功能，我们介绍了该破坏银河系恒星的锂丰度的预测。
Recently, we studied the chemical evolution of lithium in the thin disc of the Milky Way. We found that the best agreement with the observed Li abundances in the thin disc is obtained considering novae as the main source of lithium. We assumed a delay time of ~1 Gyr for nova production and an effective 7Li yield of 1.8($\pm$0.6)x10$^{-5}$ Msun over the whole nova lifetime. The possibility to check our detailed assumptions on lithium production on other stellar systems, such as the satellites of our Milky Way, is seriously hampered by their distance from us. In these systems dwarf stars (where the original lithium can be measured) are too faint to detect lithium lines. However, thanks to the Gaia mission, it was recently possible to disentangle the stars of a disrupted dwarf galaxy in the Galactic halo (called Enceladus or Galactic sausage). Adopting a chemical evolution model tuned to match the metallicity distribution function of Enceladus stars, we present our predictions for the lithium abundance of the stars of this disrupted galaxy.
