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The stellar content of the open cluster NGC 2437 (Messier 46) is investigatedusing moderately deep u*,g', and r' MegaCam images. When compared with solarmetallicity isochrones, the (g', u'-g') and (r', g'-r') CMDs are consistentwith an age log(t_yr) = 8.35 +/- 0.15, a distance modulus 11.05 +/- 0.05, and acolor excess E(B-V) = 0.115 +/- 0.035. The r' luminosity function (LF) of mainsequence stars in the magnitude range r' < 17 (i.e. masses > 0.8 solar) has ashape that follows solar neighborhood star counts. However, at faintermagnitudes the cluster LF is flat, in contrast with what would be expected fromsolar neighborhood counts. The clustering properties of stars in NGC 2437 areinvestigated by examining the two-point angular correlation functions of mainsequence stars in different brightness ranges. Main sequence stars fainter thanr' = 17 are less centrally concentrated than brighter stars and are found overa larger area of the sky, suggesting that there is a corona of faint mainsequence stars around NGC 2437. Based on the flat LF and extended spatialdistribution of faint stars, it is concluded that NGC 2437 is actively sheddingstars with masses < 0.8 solar.

The Open Cluster NGC 2437 (Messier 46)