BY Draconis variable

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BY Draconis variables are variable stars of late spectral types, usually K or M, and typically belong to the main sequence. The name comes from the archetype for this category of variable star system, BY Draconis.

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

Image: Steve Quirk, Public domain, via Wikimedia Commons.