U Geminorum

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What Wikipedia says

U Geminorum (U Gem), in the constellation Gemini, is an archetypal example of a dwarf nova. The binary star system consists of a white dwarf closely orbiting a red dwarf. Every few months it undergoes an outburst that greatly increases its brightness.

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

Image: Jimstars at English Wikipedia, CC BY-SA 2.5, via Wikimedia Commons.