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We present stellar mass fractions and composite luminosity functions (LFs)for a sample of \Ncl\ clusters from the Massive and Distant Clusters of WISESurvey (MaDCoWS) at a redshift range of $0.951 \leq z \leq 1.43$. Using SEDfitting of optical and deep mid-infrared photometry, we establish themembership of objects along the lines-of-sight to these clusters and calculatethe stellar masses of member galaxies. We find stellar mass fractions for theseclusters largely consistent with previous works, including appearing to displaya negative correlation with total cluster mass. We measure a composite$3.6~\mathrm{\mu m}$ LF down to $m^*+2.5$ for all 12 clusters. Fitting aSchechter function to the LF, we find a characteristic $3.6~\mathrm{\mu m}$magnitude of $m^*=19.83\pm0.12$ and faint-end slope of $\alpha=-0.81\pm0.10$for the full sample at a mean redshift of $\bar{z} = 1.18$. We also divide theclusters into high- and low-redshift bins at $\bar{z}=1.29$ and $\bar{z}=1.06$respectively and measure a composite LF for each bin. We see a small, butstatistically significant evolution in $m^*$ and $\alpha$ -- consistent withpassive evolution -- when we study the joint fit to the two parameters, whichis probing the evolution of faint cluster galaxies at $z\sim1$. This highlightsthe importance of deep IR data in studying the evolution of cluster galaxypopulations at high-redshift.

The Massive and Distant Clusters of WISE Survey XI: Stellar Mass Fractions and Luminosity Functions of MaDCoWS Clusters at $z \sim 1$