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We investigate the mass-to-light ratios of stellar populations as predictedby stellar population synthesis codes and compare those todynamical/gravitational measurements. In Bell & de Jong (2001) we showed thatpopulation synthesis models predict a tight relation between the color andmass-to-light ratio of a stellar population. The normalization of this relationdepends critically on the shape of the stellar IMF at the low-mass end. Thesefaint stars contribute significantly to the mass, but insignificantly to theluminosity and color of a stellar system. In Bell & de Jong (2001) we usedrotation curves to normalize the relation, but rotation curves provide only anupper limit to the stellar masses in a system. Here we compare stellar anddynamical masses for a range of stellar systems in order to constrain the massnormalization of stellar population models. We find that the normalization ofBell & de Jong (2001) should be lowered by about 0.05-0.1 dex in M/L. This isconsistent with a Kroupa (2001), Chabrier (2003) or a Kennicutt (1983) IMF, butdoes not leave much room for other unseen components.Comment: 9 pages, 3 figures. To appear in the conference proceedings of Island  Universes, Structure and Evolution of Disk Galaxies, ed. R.S. de Jong  (Springer, Dordrecht

COMPARING DYNAMICAL AND STELLAR POPULATION MASS-TO-LIGHT RATIO ESTIMATES