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Astrophysical S-factors at zero energy for the direct nuclear capturereactions $^{3}{\rm He}(\alpha, \gamma)^{7}{\rm Be}$, $^{3}{\rm H}(\alpha,\gamma)^{7}{\rm Li}$ and $^{7}{\rm Be}(p, \gamma)^{8}{\rm B}$ are estimatedwithin the framework of two-body potential cluster model on the basis ofextranuclear capture approximation of D. Baye and E. Brainis. The values ofS(0)-factors have been calculated using two different potential models for eachprocess, which were adjusted to the binding energies and empirical values ofthe asymptotical normalization coefficients from the literature. New values ofS(0)-factors have been obtained.

ASTROPHYSICAL S(0)-FACTORS FOR THE $^{3}{\rm He}(\alpha, \gamma)^{7}{\rm  Be}$, $^{3}{\rm H}(\alpha, \gamma)^{7}{\rm Li}$ and $^{7}{\rm Be}(p,  \gamma)^{8}{\rm B}$ DIRECT CAPTURE PROCESSES IN A POTENTIAL MODEL