  Let A_K be an abelian variety over a discrete valuation field K. Let A be the
Neron model of A_K over the ring of integers O_K of K and A_k its special
fibre. We study the set of rational points of the group of components \phi_A of
A_k. In particular, we look at the cases where A_K is a Jacobian or where A_K
is an abelian variety having semi-stable reduction. We also consider algebraic
tori over K instead of abelian varieties.
