What are facts about the double star?

Double stars are systems consisting of two stars that are gravitationally bound and orbit around a common center of mass. They can be classified into two main types: visual binaries, which can be resolved into two distinct stars through a telescope, and spectroscopic binaries, which cannot be individually seen but are identified through their spectral lines. Double stars provide valuable insights into stellar mass, composition, and evolutionary processes. Some well-known examples include Alpha Centauri and Sirius, which is the brightest star in the night sky.