Long distance contributions in D -> V gamma decays

Using the factorization scheme for the nonleptonic D --> VV0 weak amplitude s, we classify all diagrams which arise in D --> V gamma decays and calcula te them with the help of the hybrid model which combines the heavy quark ef fective theory and the chiral Lagrangian approach. Thus we determine the lo ng distance contribution to the amplitudes of Cabibbo allowed and Cabibbo s uppressed D --> V gamma decays. The calculation of the expected range of th e branching ratios of nine different D --> V gamma channels is compared wit h results of other approaches. The present work establishes an increase of the parity violating contribution in these decays in comparison with previo us analyses.