Superoutburst

Overview

• SS Cygni stars (UGSS), which increase in brightness by 2–6 mag in V in 1–2 days, and return to their original brightnesses in several subsequent days.
• SU Ursae Majoris stars (UGSU), which have brighter and longer "supermaxima" outbursts, or superoutbursts, in addition to normal outbursts. Varieties of SU Ursae Majoris star include ER Ursae Majoris stars and WZ Sagittae stars (UGWZ).
• Z Camelopardalis stars (UGZ), which temporarily "halt" at a particular brightness below their peak; a behavior termed a "standstill". They are interpreted as occupying the border between the classes of dwarf nova and the more stable nova-like variables.