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In this study we present the exploration of $\sim$500 spectroscopicallyconfirmed galaxies in and around two large scale structures at $z\sim1$ drawnfrom the ORELSE survey. A sub-sample of these galaxies ($\sim$150) weretargeted for the initial phases of a near-infrared MOSFIRE spectroscopiccampaign investigating the differences in selections of galaxies which hadrecently ended a burst of star formation or had rapidly quenched (i.e.,post-starburst or K+A galaxies). Selection with MOSFIRE resulted in apost-starburst sample more than double that selected by traditional $z\sim1$(observed-frame optical) methods even after the removal of the relatively largefraction of dusty starburst galaxies selected through traditional methods.While the traditional post-starburst fraction increased with increased globaldensity, the MOSFIRE-selected post-starburst fraction was found to be constantin field, group, and cluster environments. However, this fraction relative tothe number of galaxies with ongoing star formation was observed to elevate inthe cluster environment. Post-starbursts selected with MOSFIRE werepredominantly found to exhibit moderately strong [OII] emission originatingfrom activity other than star formation. Such galaxies, termed K+A withImposteR [OII]-derived Star formation (KAIROS) galaxies, were found to beconsiderably younger than traditionally-selected post-starbursts and likelyundergoing some form of feedback absent or diminished in traditionalpost-starbursts. A comparison between the environments of the two types ofpost-starbursts suggests a picture in which the evolution of a post-starburstgalaxy is considerably different in cluster environments than in the morerarefied environments of a group or the field.

Chronos and Kairos: Mosfire Observations of Post-Starburst Galaxies in z~1 Clusters and Groups