  The heavy quark effective theory and the factorization approximation are used
to treat the Cabibbo-suppressed decays of charmed baryons to vector mesons,
$\Lambda_C\rightarrow p{\rho^0}, p\omega$,
$\Xi_C^{+,0}\rightarrow\Sigma^{+,0}\phi, \Sigma^{+,0}{\rho^0},
\Sigma^{+,0}\omega$ and $\Xi_C^{0}\rightarrow\Lambda\phi, \Lambda\rho,
\Lambda\omega$. The input from two recent experimental results on $\Lambda_C$
decays allows the estimation of the branching ratios for these modes, which
turn out to be between $10^{-4}$ and $10^{-3}$. The long distance contribution
of these transitions via vector meson dominance to the radiative weak processes
$\Lambda_C\rightarrow p\gamma$, $\Xi_C\rightarrow\Sigma\gamma$ and
$\Xi_C^0\rightarrow\Lambda\gamma$ leads to quite small branching ratios,
$10^{-6}-10^{-9}$; the larger value holds if a sum rule between the coupling
constants of the vector mesons is broken.
