The spin structure of the matrix element for the reactions $\\gamma+ N\\to Y_c +{D}^*$, where $Y_c=\\Lambda_c^+(2285)$, $\\Sigma_c(2455)$ are charmed baryons with spin 1/2, and $D^*(2010)$ is the vector charmed meson, can be parametrized, in collinear regime, in terms of three independent scalar amplitudes, which are functions of the photon energy $E_{\\gamma}$, only. In framework of an effective Lagrangian approach generalized to charm photoproduction, we calculate the energy dependence of the differential cross section, the density matrix element of $\\overline{D}^*$, $\\rho_{11}$, the asymmetry $A_z$ in the collision of circularly polarized photons with polarized nucleons, and the polarization of the produced $Y_c$-hyperon, $P_z$, in the collision of circularly polarized photons with unpolarized target. All these polarization observables either vanish or are large, in absolute value, with a smooth $E_{\\gamma}$-dependence, and differ for $\\Lambda_c^+$ and $\\Sigma_c$ --production. |
