novae), or U Geminorum variable, is one of several types of cataclysmic variable star, consisting of a close binary star system in which one of the components is a white dwarf that accretes matter from its companion.
U Geminorum variable, also known as novae, is among various cataclysmic variable stars. These stars are part of a close binary system where one component is a white dwarf that collects material from its partner.