The unprecedented high precision of astrometric data released by the European Space Agency’s Gaia mission provide us a new map of nearby stars and the Milky Way we have never seen before. In this talk, I will discuss a brief history of astrometry, the importance of astrometry, and new discoveries from this mission, especially a new feature embedded in the Hertzsprung-Russell diagram. I will also present the latest results related to this feature using the data from NASA’s TESS mission and Gemini observatories, and these results will lead us to understand the connections between the changing of stellar interior structure and surface activities, which will eventually affect the habitable zones around these stars.
Speaker: Dr. Wei-Chun Jao, Georgia State University
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