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Fig. 1


Wide binaries and multiple systems with common parallaxes and relatively small angular separations (see text) in the TGAS 25 pc sample. Shown are their total proper motions (top) and angular separations (bottom) as a function of the ratio of the absolute value of their total proper motion difference dpm (see Eq. (2)) to the estimated effect caused by orbital motion (pmo). The dotted line indicates the expected maximal ratio of 1. Systems discussed in the text are labelled in the top panel and indicated by thick red and blue open symbols. For comparison we added the values for Proxima with respect to alpha CenAB (filled magenta symbols), which are not included in TGAS. The symbol sizes increase with parallax.

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