Shanghai Astronomical Observatory Astrophysics Colloquium

Title：Lithium in Open Clusters and Beyond through Stellar Abundances

Speaker：Dr.Qinghui Sun (Tsung-Dao Lee Institute)

Time：3:00 pm May 07th (Thursday)

Tencent Meeting：46822606747 password: 6360

Location: Lecture Hall, 3rd floor

Abstract：Lithium abundances in open clusters provide a powerful probe of stellar interiors and their evolution. Observed Li abundances show strong discrepancies with standard stellar evolution theory, including the long-standing F-dwarf Li dip, over-depletion in G/K dwarfs, and the existence of ultra Li-rich giants. In this talk, we present that rotationally induced mixing plays a major role in driving Li depletion beyond standard models. Meanwhile, high-resolution spectroscopy enables high-precision stellar abundance measurements, offering insights into stellar evolution, Galactic chemical evolution, and possible chemical imprints of planet formation in stellar atmospheres. This talk also presents results from abundance studies of solar twins, binaries, and open clusters, including recent results from large ground-based telescopes and JWST. By combining these approaches, we trace stellar internal processes, explore Galactic chemical evolution, identify potential chemical patterns linked to planet formation, and connect stellar and planetary compositions, highlighting current challenges and future opportunities.

CV：Qinghui Sun is currently an associate research professor at the Tsung-Dao Lee Institute, Shanghai Jiao Tong University. From 2021 to 2024, she was a Shuimu postdoctoral fellow at Tsinghua University. She received her Ph.D. in Astrophysics from Indiana University in 2021 and her B.S. in Astronomy from Nanjing University in 2015. Her research focuses on stellar properties and planet–star interactions, with extensive use of large telescopes.

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