AMBRE项目：限制Milky Way中的锂演化
The AMBRE Project: Constraining the lithium evolution in the Milky Way
摘要：
锂在银河系中的化学演化是现代天体物理学中的一个主要问题。事实上，一方面，锂在恒星内部很容易被破坏，另一方面，锂在某些特定的恒星演化阶段产生，这些阶段仍然没有得到很好的限制。本文的目的是调查银河系恒星的锂含量，以限制我们银河系中锂的化学富集，特别是在薄盘和厚盘中。得益于ESO档案中的高分辨率光谱和高质量的大气参数，我们能够为7300颗恒星建立一个大规模和均匀的锂丰度目录，这些恒星是通过自动方法耦合，合成光谱网格和高斯-牛顿算法获得的。我们用文献值验证了这些锂丰度，包括盖亚基准星的锂丰度。在锂星系演化方面，我们发现星际锂丰度随金属丰度增加1 dex，从[M/H]=-1 dex到+0.0 dex。此外，我们发现，这种锂ISM丰度减少约0.5德克斯在超太阳金属丰度。基于化学分离，我们还观察到，恒星的锂含量在厚盘增加，而金属丰度略有增加，而薄盘显示出陡峭的增加。富α、富金属恒星的锂丰度分布在A（Li）~ 3dex处有一个峰值。我们的结论是，厚盘星遭受的低锂化学富集，显示锂丰度相当接近Spite高原，而薄盘星清楚地显示出增加的锂化学富集的金属丰度，可能是由于低质量的恒星的贡献。
英文摘要：
The chemical evolution of lithium in the Milky Way represents a major problem in modern astrophysics. Indeed, lithium is, on the one hand, easily destroyed in stellar interiors, and, on the other hand, produced at some specific stellar evolutionary stages that are still not well constrained. The goal of this paper is to investigate the lithium stellar content of Milky Way stars in order to put constraints on the lithium chemical enrichment in our Galaxy, in particular in both the thin and thick discs. Thanks to high-resolution spectra from the ESO archive and high quality atmospheric parameters, we were able to build a massive and homogeneous catalogue of lithium abundances for 7300 stars derived with an automatic method coupling, a synthetic spectra grid, and a Gauss-Newton algorithm. We validated these lithium abundances with literature values, including those of the Gaia benchmark stars. In terms of lithium galactic evolution, we show that the interstellar lithium abundance increases with metallicity by 1 dex from [M/H]=-1 dex to +0.0 dex. Moreover, we find that this lithium ISM abundance decreases by about 0.5 dex at super-solar metalllicity. Based on a chemical separation, we also observed that the stellar lithium content in the thick disc increases rather slightly with metallicity, while the thin disc shows a steeper increase. The lithium abundance distribution of alpha-rich, metal-rich stars has a peak at A(Li)~3 dex. We conclude that the thick disc stars suffered of a low lithium chemical enrichment, showing lithium abundances rather close to the Spite plateau while the thin disc stars clearly show an increasing lithium chemical enrichment with the metallicity, probably thanks to the contribution of low-mass stars.
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