AM Herculis

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What Wikipedia says

AM Herculis is a binary variable star located in the constellation Hercules. This star, along with the star AN Ursae Majoris, is the prototype for a category of cataclysmic variable stars called polars, or AM Her type stars.

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

Image: PopePompus, CC BY-SA 4.0, via Wikimedia Commons.