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Asteroseismology and cluster research can mutually benefit each other, yet synergistic studies between the two are still limited. On one hand, we can measure the temperature, luminosity, and mass of cluster member stars with high precision, which allows for more efficient constraints on asteroseismology models compared to single stars. On the other hand, asteroseismic investigation into the interiors of stars can also address questions about cluster evolution, such as how rotation and internal element transport affect stellar evolution, as well as the formation of extended main-sequence turn-off and blue stragglers.
We collected photometric data from four open clusters in the Kepler field and two open clusters within the TESS continuous viewing zones in both the northern and southern hemispheres, discovering a significant number of variable stars. We pay special attention to A- to F-type stars, as their internal oscillations reveal the physical conditions at the edge of their convective cores. We found that young A-type main sequence stars can rotate at up to half the breakup rate, while the rotation rate of older A-type main sequence stars slows down with age. The variable stars in these clusters provide excellent samples for further exploration of angular momentum transfer and internal element mixing.
Speaker Introduction: Gang Li obtained his PhD from the University of Sydney. He conducted postdoctoral research at IRAP in Toulouse, France, and is currently engaged in postdoctoral research at KU Leuven in Belgium. His research focuses on observational asteroseismology, utilizing asteroseismology to explore stellar internal rotation, magnetic fields, and binary star tidal effects.
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