The charm contribution into the proton structure function in DIS at the HERA ep-collider

In the framework of perturbative QCD and a model for the production of charmed hadrons the structure function $F_2^c$ is calculated and compared with the experimental data of H1 and ZEUS Collaborations. We show that the spectator mechanism of the $D^{\ast }$-meson production independent of a hadronic remnant is valid at $p_T>10$ GeV, only. We find that the evolution of $F_2^c(x,Q^2)$ versus the virtuality $Q^2$ can be neglected in the kinematic region of HERA.