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We have obtained velocity dispersions from Keck high-resolution integratedspectroscopy of ten M31 globular clusters (GCs), including three candidateintermediate-age GCs. We show that these candidates have the same V-bandmass-to-light (M/L_V) ratios as the other GCs, implying that they are likely tobe old. We also find a trend of derived velocity dispersion with wavelength,but cannot distinguish between a systematic error and a physical effect. Ournew measurements are combined with photometric and spectroscopic data from theliterature in a reanalysis of all M31 GC M/L_V values. In a combined sample of27 GCs, we show that the metal-rich GCs have *lower* M/L_V than the metal-poorGCs, in conflict with predictions from stellar population models. Fragmentarydata for other galaxies support this observation. The M31 GC fundamental planeis extremely tight, and we follow up an earlier suggestion by Djorgovski toshow that the fundamental plane can be used to estimate accurate distances(potentially 10% or better).

Mass-to-Light Ratios for M31 Globular Clusters: Age-Dating and a Surprising Metallicity Trend