runawaybinar

A Hubble image of the binary stars Sirius A and B. Sirius B, the very faint companion, is a white dwarf, an evolved star that has burned its nuclear fuel. There is one known binary star pair consisting of two white dwarfs that is also a “runaway” star, moving very rapidly through the galaxy. A new study concludes that this runaway star was probably ejected from a dense stellar cluster. Credit: NASA/Hubble