Stellar kinematics#Runaway stars

Runaway Star ( also outliers) are O and B stars, exceptionally fast in comparison to neighboring stars - their orbits through the Milky Way - with radial velocities between about 30 and 200 km / s. They are moving at supersonic speed through the interstellar matter. The proper motion of a runaway star is in many cases just a star away association whose member he was probably therefore been earlier and then thrown out of her.

To explain this throw out two options are available: According to one theory caused a supernova explosion in a multiple star system that the other components were driven away by energy transfer as " outliers". The other theory assumes that there are two double stars were so close that some of its components were continuously fired due to gravitational interaction at high speeds.

The best known examples are the star AE Aurigae, My Columba and 53 Arietis, the / s traveling at more than 100 km apart. If we add from their velocities and directions of motion of their space webs back, shows that this near the Orion Nebula cut in front of about 3 million years, which is closed to a previous affiliation of the three stars to the Orion association. Other examples of " outliers " are Zeta Ophiuchi and 68 Cygni.