Dwarf nova

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What Wikipedia says

A dwarf nova (pl. 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. Dwarf novae are dimmer and repeat more often than "classical" novae.

Excerpt from the Wikipedia article “Dwarf nova”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Alan Bedard, CC BY-SA 3.0, via Wikimedia Commons.