  Data samples corresponding to the isospin-violating decay $D_s^{*+}\to D_s^+
\pi^0$ and the decays $D_s^{*+}\to D_s^+\gamma$, $D^{*0}\to D^0\pi^0$ and
$D^{*0}\to D^0\gamma$ are reconstructed using 90.4 ${\rm fb}^{-1}$ of data
recorded by the BaBar detector at the PEP-II asymmetric-energy $e^+e^-$
collider. The following branching ratios are extracted: $\Gamma(D_s^{*+}\to
D_s^+ \pi^0)/\Gamma(D_s^{*+}\to D_s^+\gamma) = 0.062\pm0.005 ({\rm
stat.})\pm0.006 ({\rm syst.})$ and $\Gamma(D^{*0}\to D^0\pi^0)/\Gamma(D^{*0}\to
D^0\gamma) = 1.74\pm0.02 ({\rm stat.})\pm0.13 ({\rm syst.})$. Both measurements
represent significant improvements over present world averages.
