Stars are “running away” from the Milky Way: why is this happening?
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A team of astronomers has found a whole group of stars heading beyond the Milky Way galaxy.
Scientists came to the conclusion that the stars that “run away” belong to different types: O and Ve. These stars are very hot and young. They don’t live too long and explode, but they are the brightest in our galaxy, writes Science Alert.
Scientists have discovered that 69 stars of type Be and 106 of type O “escape” from the Milky Way. In general, stars of type O move faster than stars of type Be.
Researchers talked about 2 theories why stars “run away”.
| Zeta Ophiuchus is a runaway star. Photo: NASA/JPL-Caltech |
One of them is the dynamical ejection scenario (DES), the other is the binary supernova scenario (BSS).
According to the BSS scenario, supernovae often form in pairs. One star explodes as a supernova, and the explosion pushes the other star away.
When one star explodes as a supernova, the shock wave pushes the other star away. If this star manages to break away from the object that appeared as a result of the explosion, then it can also escape the gravitational influence of the Milky Way and begins its long journey into intergalactic space.
According to the DES theory, a binary star system is hit by a lone star. Such a collision leads to the fact that the pair breaks up and one of the stars goes on a long flight outside the galaxy.
“The higher percentage and higher velocities found for the O-type compared to the Be-type emphasize that the dynamical ejecta scenario is more likely than the binary supernova scenario“, scientists summarize.
In general, according to different estimates of scientists, up to 10 million runaway stars may leave our galaxy.
It will be recalled that new studies have shown that the Milky Way galaxy may have a different shape than previously thought.
Read also: “The Webb Telescope discovered the farthest twin galaxy of the Milky Way”
Iryna Bura, UP. Life
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