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The heavy quark effective theory and the factorization approximation are usedto 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, whichturn out to be between $10^{-4}$ and $10^{-3}$. The long distance contributionof 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 couplingconstants of the vector mesons is broken.Comment: 11 pages, latex, no figure

Two-body Cabibbo-suppressed decays of charmed baryons into vector mesons and into photons