Proper motion diagram of the sources with G ≤ 15 mag in the ASCC 123 field (center coordinates α(2000) = 22h42m35s, δ(2000) = +54°15′35″, radius 75′). The stars investigated in the present paper are indicated with big dots (red for single stars, blue for SB2 systems). The candidate members according to Cantat-Gaudin et al. (2018) are represented as small gray filled circles; the green asterisk denotes the average proper motion of ASCC 123 according to Cantat-Gaudin et al. (2018) and the dashed ellipse is the 5σ contour. The three non-members that lie outside this locus are also labeled with their ID.
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