A catalog of wide binary and multiple systems of bright stars from Gaia-DR2 and the Virtual Observatory
Binary
and multiple stars have long provided an effective empirical method of
testing stellar formation and evolution theories. In particular, the
existence of wide binary systems (separations $>$20,000 au) is
particularly challenging to binary formation models as their physical
separations are beyond the typical size of a collapsing cloud core
($\sim$5,000$-$10,000 au).
https://arxiv.org/abs/1901.03730
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