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In astronomy, 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 teardrop-shaped region bounded by a critical gravitational equipotential , with the apex of the teardrop pointing towards the other star (the apex is at the L 1 Lagrangian point ...
The dashed line is the rotation axis. (a) Both stars lie within their Roche lobes, star 1 on the left (mass M1 in red) and star 2 on the right (mass M2 in orange). (b) Star 1 has grown to nearly fill its Roche lobe. (c) Star 1 has grown to overfill its Roche lobe and transfer mass to star 2: Roche lobe overflow.
The black lines represent the inner critical Roche equipotentials, the Roche lobes. Another classification is based on the distance between the stars, relative to their sizes: [ 28 ] Detached binaries are binary stars where each component is within its Roche lobe , i.e. the area where the gravitational pull of the star itself is larger than ...
The Roche limit typically applies to a satellite's disintegrating due to tidal forces induced by its primary, the body around which it orbits. Parts of the satellite that are closer to the primary are attracted more strongly by gravity from the primary than parts that are farther away; this disparity effectively pulls the near and far parts of ...
The pulse period of PSR B1620-26 is a few milliseconds, providing strong evidence for matter transfer. It is believed that as the pulsar's red giant companion expanded, it filled and then exceeded its Roche lobe, so that its surface layers started being transferred onto the neutron star. The infalling matter produced complex and spectacular ...
The stellar wind and Roche lobe overflow of the massive normal star accretes in such large quantities, the transfer is very unstable and creates a short lived mass transfer. Once a HMXB has reached its end, if the periodicity of the binary was less than a year, it can become a single red giant with a neutron core or a single neutron star.
In a contact binary, both stars have filled their Roche lobes, allowing the more massive primary component to transfer both mass and luminosity to the secondary member. As a result, the components in a contact binary often have similar effective temperatures and luminosities, regardless of their respective masses.
Édouard Albert Roche (French: [edwaʁ albɛʁ ʁɔʃ]; 17 October 1820 – 27 April 1883) was a French astronomer and mathematician, [1] who is best known for his work in the field of celestial mechanics. His name was given to the concepts of the Roche sphere, Roche limit, and Roche lobe. He also was the author of works in meteorology.