中国科学院云南天文台学术报告通知

2025年第61期

报告题目：Coupling 1D stellar evolution with 3D simulations on-the-fly: method, validation and applications

报告人：周一啸 博士

报告人单位：挪威奥斯陆大学

报告语言：中文

报告时间：2025年12月11日（星期四）10:30-12:00

报告地点：科研1号楼412会议室

报告摘要：

Models of stellar structure and evolution are among the most important instruments in astrophysics. They are a major method for determining the age of stars. Nevertheless, a significant weakness in stellar structure and evolution modeling is the simplified treatment of convection, which leads to erroneous near-surface stratification and considerable uncertainties in predicted effective temperatures of low-mass stars. We developed a novel method for coupling 1D stellar structural models with a grid of 3D surface convection simulations during stellar evolution, across a wide range of metallicities. This 1D-3D coupling method slightly shifts evolutionary tracks relative to standard calculations, meanwhile providing oscillation frequencies that agree more closely with asteroseismic observations. Our methodology is validated against eclipsing binary systems with precise observational constraints as well as stars in binaries with asteroseismic data. Additionally, by comparing the measured surface temperature from the APOKASC3 catalog with predictions from 1D-3D coupled models, we demonstrate that the temperature offset strongly correlates with the magnitude of alpha enhancement rather than overall metallicity, as indicated by previous works. Finally, we computed isochrones and bolometric corrections based on the 1D-3D coupling method, and validated the isochrone with benchmark clusters such as M67. Coupling 1D stellar evolution models with 3D simulations greatly reduces uncertainties associated with the choice of atmosphere boundary conditions and mixing-length parameters, offering a powerful tool for the age determination of globular clusters as well as stars with seismic measurements.

报告人简介： 

Yixiao Zhou is a Marie Curie postdoc fellow at Rosseland Center for Solar Physics, University of Oslo, Norway. He did his PhD at the Australian National University. Dr. Zhou's research focuses on asteroseismology, solar and stellar convection simulations, and stellar evolution modeling. He is an active developer of the 3D MHD code Stagger and stellar evolution code GARSTEC.

云台邀请方：恒星物理研究团组、国际超新星中心

邀请方联系人：吴涛