IC 405 - Flaming Star Nebula
1,500 light years from Earth in the Northern constellation of Auriga, this reflective (blue) and emissions (red) nebula holds some interesting secrets.
The proper motion (the direction of travel of the star) of the central star appears to lead back to the Orion Nebula.
More so, recent research on a white dwarf named J0927 has suggested it may be the fastest moving known star in our galaxy, moving at over 5 million miles per hour, enough to actually break through the galaxy gravity and spin off into intergalactic space.
For a while dwarf to have reached these speeds, it must have been ejected from a type 1a supernova, and a very special type at that.
Type 1a supernova's occur when a white dwarf gains mass, exceeds the Chandrashekar limit and goes supernova, normally from a close partner. In this instance it is thought two white dwarfs that had significant left overs of helium from their former red giant stars got too close and the helium accreted to one and cause the white dwarf to re-animate itself, in what is known as a dynamically driven double-degenerate double-detonation (D6) supernova.
Many stars in our night sky have high proper-motions, although most is because their orbit around our galaxy differs significantly from ours, but these few examples of stars with hypervelocity make you understand that intergalactic space is probably full of stars, many speeding away from their galaxy of origin, some that may even get captured by our Milky Way, even if they are white dwarfs.
Source :
Astronomers discovered a new population of ultra-fast-moving stars, including the fastest 'runaway' star ever seen in our galaxy.