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The Solar Neighborhood. LII. M Dwarf Twin Binaries—Presumed Identical Twins Appear Fraternal in Variability, Rotation, Hα, and X-Rays

Henry, Todd J.; Osten, Rachel A.; Jao, Wei-Chun +4 more

We present an investigation into the rotation and stellar activity of four fully convective M dwarf "twin" wide binaries. Components in each pair have (1) astrometry confirming they are common-proper-motion binaries, (2) Gaia BP, RP, and 2MASS J, H, and K _s magnitudes matching within 0.10 mag, and (3) presumably the same age and compo…