Kaksiktähed

Kaksiktähed are binary star systems consisting of two stars that orbit a common center of mass. These systems are a common phenomenon in the universe, with estimates suggesting that over half of all stars are part of a binary or multiple star system. The gravitational interaction between the two stars dictates their orbital paths, which can range from very close to widely separated.

The stars within a binary system can vary significantly in their properties. They may have similar masses, or one star can be much more massive than the other. Their evolutionary stages can also differ, leading to a wide array of observed binary configurations. For example, one star might be a main-sequence star while its companion is a white dwarf, a neutron star, or even a black hole.

The study of binary stars is crucial for understanding stellar evolution and fundamental astrophysical properties. By observing the orbital motion of the stars, astronomers can accurately determine their masses, which is often difficult to do for isolated stars. Furthermore, interactions between the stars in close binary systems can lead to phenomena such as mass transfer, supernovae, and the formation of exotic objects. Different types of binary stars are classified based on how they are observed, including visual binaries, spectroscopic binaries, eclipsing binaries, and astrometric binaries. Each method provides unique insights into the nature of these stellar pairs.