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Optical interferometry and <i>Gaia</i> measurement uncertainties reveal the physics of asymptotic giant branch stars
Context. Asymptotic giant branch stars are cool luminous evolved stars that are well observable across the Galaxy and populating Gaia data. They have complex stellar surface dynamics Aims. On the AGB star CL Lac, it has been shown that the convection-related variability accounts for a substantial part of the Gaia …