These objects were the subject of Otto Struve's Algol paradox, which was resolved by Gerard Kuiper, and a recent class of these systems to be discovered is the class of cataclysmic variables. Methods of detecting these systems include visual, spectroscopic, and eclipsing methods, as well as detections of instances of common proper motion, and the orbital periods of these systems provide the most direct and precise way of measuring solar masses. These systems usually undergo mass transfer between components through the first Lagrange point once one half has filled its Roche lobe, and examples include systems like the Hulse-Taylor system, whose decaying period provides evidence for gravitational waves, and the Xi Ursae Majoris system, the first for which orbital ellipticity was established. Also including systems like the one containing Cas
These objects were the subject of Otto Struve's Algol paradox, which was resolved by Gerard Kuiper, and a recent class of these systems to be discovered is the class of cataclysmic variables. Methods of detecting these systems include visual, spectroscopic, and eclipsing methods, as well as detections of instances of common proper motion, and the orbital periods of these systems provide the most direct and precise way of measuring solar masses. These systems usually undergo mass transfer between components through the first Lagrange point once one half has filled its Roche lobe, and examples include systems like the Hulse-Taylor system, whose decaying period provides evidence for gravitational waves, and the Xi Ursae Majoris system, the first for which orbital ellipticity was established. Also including systems like the one containing Castor and Pollux, for ten points, identify these systems that consist of two stars gravitationally bound to each other.
These objects were the subject of Otto Struve's Algol paradox, which was resolved by Gerard Kuiper, and a recent class of these systems to be discovered is the class of cataclysmic variables.
{binary} systems (or {binaries})