An explicit calculation is performed to check all the tangent bundle gravit
ational couplings of Dirichlet branes and Orientifold planes by scattering
q gravitons with a p + 1 form Ramond-Ramond potential in the world-volume o
f a D(p + 2q)-brane. The structure of the D-brane Wess-Zumino term in the w
orld-volume action is confirmed, while a different O-plane Wess-Zumino acti
on is obtained. (C) 1999 Elsevier Science B.V. All rights reserved.