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Star cluster members are formed simultaneously from the same giant molecular cloud and have similar ages and metallicity. Photometric and spectroscopic observations of individual stars and clusters reveal a range of details, including chemical abundances, radial velocities, multiplicity, mass, distance, and age. Lithium, both destroyed and produced within stars, stands as a pivotal element in revealing internal stellar processes. This talk covers 1) Investigating the Lithium pattern in dwarfs, confirming the role of rotational mixing, and 2) Exploring the internal and external factors contributing to the formation of Lithium-rich giants, offering insights into stellar internal processes. Furthermore, comprehending interactions between stars and planets is crucial in understanding the properties, formation, and evolution of planetary systems. For example, analyzing the correlation between planetary and stellar atmosphere abundances aids in distinguishing different planet formation scenarios.
Dr. Qinghui Sun is a Postdoctoral Shuimu fellow at Tsinghua University, China. She earned her Ph.D. in Astrophysics from Indiana University in February 2021 and B.S. in Astronomy at Nanjing University in July 2015. She specializes in studying stellar properties and the interactions between planets and their host stars. Recently, she has expanded to applying machine learning to astrophysics.
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