Roche lobe

A three-dimensional representation of the Roche potential in a binary star with a mass ratio of 2, in the co-rotating frame. The droplet-shaped figures in the equipotential plot at the bottom of the figure define what are considered the Roche lobes of the stars. L1, L2 and L3 are the Lagrangian points where forces (considered in the rotating frame) cancel out. Mass can flow through the saddle point L1 from one star to its companion, if the star fills its Roche lobe.[1]

The Roche lobe is the region around a star in a binary system within which orbiting material is gravitationally bound to that star. It is an approximately tear-drop-shaped region bounded by a critical gravitational equipotential, with the apex of the tear drop pointing towards the other star (the apex is at the L₁ Lagrangian point of the system).

单词	Roche lobes
释义	Roche lobes 英语百科 Roche lobe The Roche lobe is the region around a star in a binary system within which orbiting material is gravitationally bound to that star. It is an approximately tear-drop-shaped region bounded by a critical gravitational equipotential, with the apex of the tear drop pointing towards the other star (the apex is at the L₁ Lagrangian point of the system).
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Roche lobes

Roche lobe