AM Canum Venaticorum star

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An AM Canum Venaticorum star (AM CVn star) is a rare type of cataclysmic variable star named after their type star, AM Canum Venaticorum. In these hot blue binary variables, a white dwarf accretes hydrogen-poor matter from a compact companion star.

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

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