Fig. 9.

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Color-period diagrams (panels a – d) and CMDs (panels e – h) for wide binaries containing an MS (filled symbols) and evolved star (open symbols) combination. The CPDs show the wide binaries in relation to the open cluster sample. We recall that not all evolved components have known rotation periods. For those without, only an unconnected MS component appears in the CPD. The CMDs show the wide binaries (binned by age and color coded accordingly) against a background of the Gaia DR3 parameters for the full El-Badry et al. (2021) sample (2.6M stars). The isochrones (PARSEC) were chosen to match the colors of the components of each binary. Four binaries are highlighted in red and individually identified in the legend. These binaries include two wide binaries composed of two evolved stars (panel e), one that does not have a consistent CMD position (panel b), and one that is arguably older than 4 Gyr. The separation of the CMD into four panels and the selection of the individual ages shown in them is for visibility purposes only. The CMD positions of binaries 21 and 346 suggest an age of ≈7 Gyr; however, no corresponding isochrone is shown for visibility reasons.
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