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We present UV broadband photometry and optical emission-line measurements fora sample of 32 Brightest Cluster Galaxies (BCGs) in clusters of theRepresentative XMM-Newton Cluster Structure Survey (REXCESS) with z =0.06-0.18. The REXCESS clusters, chosen to study scaling relations in clustersof galaxies, have X-ray measurements of high quality. The trends of starformation and BCG colors with BCG and host properties can be investigated withthis sample. The UV photometry comes from the XMM Optical Monitor, supplementedby existing archival GALEX photometry. We detected H\alpha and forbidden lineemission in 7 (22%) of these BCGs, in optical spectra. All of the emission-lineBCGs occupy clusters classified as cool cores, for an emission-line incidencerate of 70% for BCGs in cool core clusters. Significant correlations betweenthe H\alpha equivalent widths, excess UV production in the BCG, and thepresence of dense, X-ray bright intracluster gas with a short cooling time areseen, including the fact that all of the H\alpha emitters inhabit systems withshort central cooling times and high central ICM densities. Estimates of thestar formation rates based on H\alpha and UV excesses are consistent with eachother in these 7 systems, ranging from 0.1-8 solar masses per year. Theincidence of emission-line BCGs in the REXCESS sample is intermediate, somewhatlower than in other X-ray selected samples (-35%), and somewhat higher than butstatistically consistent with optically selected, slightly lower redshift BCGsamples (-10-15%). The UV-optical colors (UVW1-R-4.7\pm0.3) of REXCESS BCGswithout strong optical emission lines are consistent with those predicted fromtemplates and observations of ellipticals dominated by old stellar populations.We see no trend in UV-optical colors with optical luminosity, R-K color, X-raytemperature, redshift, or offset between X-ray centroid and X-ray peak (<w>).

Star formation and UV colors of the brightest Cluster Galaxies in the representative XMM-Newton Cluster Structure Survey