What shape do the stars have?

Non-rotating single stars are spherical. The spinning star is flattened from the poles. In close binaries, the shape of the stars is more complex. While the size of the star is small compared to the size of the Roche lobe, its shape resembles a triaxial ellipsoid. As one approaches the Roche lobe, its shape becomes asymmetric. And, finally, a “nose” appears near the inner Lagrange point of the star that has filled the Roche lobe. The star becomes like a pear.

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