恒星锂丰度研究进展

锂是少数几种在大中生成的元素之一，研究锂丰度对于探讨各种元素核合成理论以及星系的早期化学演化规律都具有十分重要的意义，阐述了有关恒星（类太阳星，晕族恒星和主序前得）及星团锂丰度的新近观测结果。介绍了在锂的核合成理论研究方面非局部热动平衡效应的影响及锂在恒星演化中的衰竭机制等理论的研究进展和存在的问题。

New Progress in the Study of Stellar Lithium Abundance

Lithium is one of the few nuclei which are synthesized during the Big Bang, the abundancesof which are of importance for our understanding of many problems, ranging from primordialnucleosynthesis, to the chemical evolution of our Galaxy. We summarized the recent observationalresults of lithium abundance in solar-like stars, halo stars, pre-main sequence stars and stars incluster. We also presellts here Non-LTE effects on analysing lithium abundance and some lithiumdepletion meChanisms. Disk stars are relatively young and have a high lithium abundance witha large scatter, while the old halo stars have relatively low lithium abundance with a smalldispersion. Whether Spite plateau is real or not is still in discussion. Both supernovae and massiveAGB are the main sources of lithium production in stars. The available depletion mechallisms,such as mass loss, convective overshooting, microscopic diffusion and rotational mixing, can onlyexplain part of the observations.