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We measure the [${\alpha}$/Fe] abundances for 183 quiescent galaxies at z =0.60 - 0.75 with stellar masses ranging 10.4 \leq log10 10.4 $\leq$ log10(M$_*$ /M$_\odot$) $\leq$ 11.6 selected from the LEGA-C survey. We estimate[${\alpha}$/Fe] from the ratio of the spectral indices Mgb (${\lambda} \sim5177$ {\AA}) and Fe4383, compared to predictions of simple stellar populationmodels. We find that 91% of quiescents in our sample have supersolar[${\alpha}$/Fe], with an average value of [${\alpha}$/Fe] = +0.24 $\pm$ 0.01.We find no significant correlation between [${\alpha}$/Fe] and stellarmetallicity, mass, velocity dispersion, and average formation time. Galaxiesthat formed the bulk of their stellar mass on time scales shorter than 1 Gyrfollow the same [${\alpha}$/Fe] distribution as those which formed on longertime scales. In comparison to local early-type galaxies and to stacked spectraof quiescent galaxies at z = 0.38 and z = 0.07, we find that the average[${\alpha}$/Fe] has not changed between z = 0.75 and the present time. Our workshows that the vast majority of massive quiescent galaxies at z $\sim$ 0.7 are${\alpha}$-enhanced, and that no detectable evolution of the average[${\alpha}$/Fe] has taken place over the last $\sim$ 6.5 Gyr.

The elemental abundances of quiescent galaxies in the LEGA-C survey: the (non-)evolution of [{\alpha}/Fe] from z = 0.75 to z = 0