  Axion fields provide the most elegant solution to the strong CP problem. In
string compactifications it is difficult to obtain an axion whose decay
constant is consistent with current cosmological bounds. We examine this
question in theories with accidental U(1) symmetries that appear as low energy
remnants of discrete symmetries. We refer to the axion-like particles from the
spontaneous breakdown of these symmetries as accions. In such systems, the
accion decay constant depends on the vacuum configuration and can be lowered to
fit the bounds. Furthermore, we find that such accions with consistent decay
constant can be embedded in special vacua of Z_6-II orbifold models with
realistic features.
