At a distance of about 440 light-years from us, a runaway star flies through space – this is a special class of stars, which are not so many in the Milky Way.
In our galaxy, there are stars that do not revolve around the galactic center, but fly through space at great speed. Such stars are called runaway stars and their study helps astronomers learn more about the catastrophic events that occur in the universe. One of the strangest stars in the galaxy is Zeta Ophiuchus, which lies about 440 light-years away. Although there is a lot of information about it, scientists have again returned to the study of this star to verify one observation, according to ScienceAlert.
Zeta Ophiuchus is a runaway star, of which there are not so many in the galaxy. It flies through space at a speed of about 30-40 km/s, or about 160 thousand km/h. This is a young star, which is about 4 million years old and is still undergoing the process of converting hydrogen into helium in its core. Scientists believe that this very hot star, which is 20 times the mass of the Sun, 8 times the size, and glows blue, will live for about 4 million years.
The reason for the flight of Zeta Ophiuchus
For a long time, scientists did not know what caused her flight. But recent research has shown that Zeta Ophiuchus set off on her very fast journey in a supernova explosion. The exploded star was a companion of Zeta Ophiuchus and after the explosion turned into a pulsar and also went on a distant flight.
In images from the Chandra space telescope, scientists have found that Zeta Ophiuchus creates a huge shock wave in the interstellar cloud through which it flies through. This cloud was created from the material that the star emits and the interstellar gases that it collides with. The scientists also detected not only X-ray radiation around the star, but also thermal radiation from the shock wave.
< h2>New Research
Samuel Greene and his colleagues at the Dublin Institute for Advanced Study, Ireland set out to find out, on the basis of the available data, whether the dynamics of the shock wave could explain the existence of the cloud as well as thermal radiation. Scientists have created computer models and it turned out that their results do not correspond to observations of the star Zeta Ophiuchus. Observations have shown that the brightest X-rays come from the cloud around the star, and simulations have shown that the brightest X-rays come from the shock itself.
At this stage, scientists believe that either there is not enough data for modeling, or astronomers still misunderstand what is happening to the star and its surrounding matter. Therefore, Irish scientists will continue their research.
The fastest stars in the galaxy
At present, the fastest runaway star in the Milky Way is considered to be a star called S5-HVS1. Its speed is 1700 km/s and it flew away as a result of interaction with a super massive black hole in the center of our galaxy – Sagittarius A *.
The fastest known star in the Galaxy – S4714 – revolves around the same black hole. Its speed is 24,000 km/s. As Focus already wrote, another star near the black hole Sagittarius A* also claims to be one of the fastest in the galaxy – this is the star S4716 with a flight speed of 8 thousand km/s.
As for black holes, scientists have learned how the very first ones appeared in the early Universe, as Focus already wrote.
Focus also wrote about that scientists have discovered one of the fastest neutron stars that can leave the Milky Way. This pulsar flies through space at a speed of 2.2 million km/h.