  We present S factor data obtained from the Coulomb dissociation of 83
MeV/nucleon 8B, and analyze 7Be longitudinal momentum distributions measured at
44 and 81 MeV/nucleon using a potential model, first-order perturbation theory,
and dynamical solution of the time-dependent Schroedinger equation. Comparing
our results with independent continuum-discretized coupled channels
calculations, we study the reaction model and beam energy dependence of the E2
contribution to the dissociation cross section. By fitting radiative capture
and Coulomb breakup data taken below relative energies of 400 keV with
potential models constrained by 7Li + n and 7Be + p elastic scattering data, we
examine the mutual consistency of recent S17 measurements and obtain a
recommended value for S17(0) of 18.6 +/- 0.4 (experimental) +/- 1.1
(extrapolation) eV b (1 sigma). This result is in good agreement with recent
experimental determinations of the asymptotic normalization coefficient of the
valence proton wave function in 8B.
