DescriptionCommon envelope phase - ejection or merger.svg
English: Stages of a common envelope phase in a binary star system.
Top: A star fills its Roche lobe and begins mass transfer to its companion.
Middle: The companion is engulfed; the core and companion spiral towards one another inside a common envelope.
Bottom: Either the envelope is ejected and a binary system composed of the core and companion forms or the stars merge and a rapidly rotating single star forms.
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