We review the observational properties of transient systems made by a neutron
star primary and a late dwarf companion (known also as Soft X-ray Transients)
during their quiescent state. We focus on the several emission mechanisms
proposed and try to compare them with observations. Finally, we review new
tools to improve our comprehension of the physics of the emission processes.Comment: 6 pages, talk presented at the Symposium: "Plasmas in the Laboratory
and in the Universe: new insights and new challenges", September 16-19, 2003,
Como, Italy. Macros include
