Despite the efforts made in recent decades to obtain more realistic stellar models, considerable uncertainties still remain due to our incomplete knowledge of some complex physical processes that occur within them, such as accretion, convection, mass loss, rotation, to name a few of them. Modeling these processes still relies on empirical calibrations and this has a significant impact on theoretical predictions such as masses, ages and abundances of stars and stellar populations, which we commonly use to answer fundamental questions in astrophysics. Building on our stellar evolution code "PARSEC", I will focus on a few aspects that deserve special attention: the role of mixing, rotation and mass loss in the evolution of stars. Mixing is one of the most important processes because stars will never forget its effects in subsequent evolution. It can be the result of convective motions and microscopic diffusion but also of differential rotation. Regarding the latter phenomenon, I will examine a critical test to disentangle the role of core overshooting and rotation in stars. I will also discuss the effects of overshoot at the base of the convective envelope and show its possible large impact on the evolution of more massive stars. Finally, I will review the most recent mass loss models and show how this quite debated phenomenon can strongly influence the yields and ultimate fate of intermediate-mass and massive stars.
BIO
Alessandro Bressan，意大利共和国功勋勋章获得者 ，中国科学院 PIFI 杰出学者，意大利 International School for Advanced Studies (SISSA)教授。其工作深切影响了恒星物理、星族合成、星系演化、星际介质尘埃等领域的发展，涵盖了恒星结构与演化理论、第一代恒星形成、星系演化及星族合成、黑洞形成、星际介质尘埃性质、暗物质、星团、 太阳中微子等诸多领域。Bressan 教授是现今世界上被引用最多的天文学家之一。截止到2024年8月，其论文引用已超过 53000 次，其中单篇超过 1000 引用的论文有10篇。由他开拓和主导的恒星演化模型 PARSEC 是世界上应用最广的恒星模型之一，该模型的第一篇文章为 MNRAS 2010年-2020年十年最高引用论文。
Host: Shude Mao
