  We analyze charm meson semileptonic decays using the measured ratios
$\Gamma_L/\Gamma_T$ and $\Gamma_{+}/\Gamma_{-}$ from $D\to {\bar K}^{*}$ and
the branching ratios for $D \to {\bar K}^{*}$ and $D \to {\bar K}$. First we
introduce the light vector mesons in a model which combines the heavy quark
effective Lagrangian and the chiral perturbation approach. We propose a method
which predicts the behavior of the form factors. Using the available
experimental data we determine the values of some model parameters and
reproduce the observed branching ratios for $D_{s} \to \Phi$, $D_{s} \to (\eta
+ \eta^{\prime})$ and $D \to \pi$. We make predictions for the yet unmeasured
branching ratios and polarization observables.

High Energy Physics - Phenomenology