Image Details
Caption: Figure 4.
Gaia DR3 activity index as a function of the effective temperature. Shown are PM comoving targets (white circles), 3D comoving targets (blue circles), α Per (purple inverted triangles; A. W. Boyle & L. G. Bouma 2023), the Pleiades (yellow triangles; L. M. Rebull et al. 2016), and Hyades (pink diamonds; S. Oh & N. W. Evans 2020). Theia 427 (M. Kounkel et al. 2020) is also shown as black x’s.
© 2026. The Author(s). Published by the American Astronomical Society.