Abundances of Gaia EDR3 comoving pairs

We present detailed chemical abundances of 62 stars in 31 comoving pairs with separations of 10^2^-10^7^ au and 3D velocity differences <2km/s. This sample includes both bound comoving pairs/wide binaries and unbound comoving pairs.

Observations were taken using the Magellan Inamori Kyocera Echelle (MIKE) spectrograph on board the Magellan/Clay Telescope at high resolution (R~45000) with a typical signal-to-noise ratio of 150pixel^-1^. With these spectra, we measure surface abundances for 24 elements, including Li, C, Na, Mg, Al, Si, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Sr, Y, Zr, Ba, La, Nd, and Eu. Taking iron as the representative element, our sample of wide binaries is chemically homogeneous at the level of 0.05dex, which agrees with prior studies on wide binaries.