Astronomers: the Solar system could be born inside a giant star

© Photo : ESA/Hubble & NASA, Acknowledgement: Judy SchmidtТуманность M1-67 around the star wolf — Rayet WR 124Astronomers: the Solar system could be born inside a giant star© Photo : ESA/Hubble & NASA, Acknowledgement: Judy Schmidt

. The matter of the future of the Solar system could not be born in the depths of supernovae, and in the so-called star wolf-Rayet – very unstable, hot and large star, surrounded by the cocoon of gas and dust, according to a paper published in the Astrophysical Journal.

«In primordial matter of the Solar system contains large amounts of aluminium-26 and almost no iron-60. Supernovae produce both isotopes in large quantities, which makes us wonder why one of them was in the matter of the Sun and planets, and the other it contains very little», — says Dwarkadas Vikram (Vikram Dwarkadas) from the University of Chicago (USA).

Today, virtually all planetary scientists believe that the Sun, Earth and other «residents» of the Solar system originated in a small gas-dust nebula, traces of which can be found in the most ancient asteroids the chondrites and comets. On the other hand, the question of how did this cloud, remains the subject of fierce controversy among astronomers.

The fact that primary matter of the Solar system had a very unusual chemical and isotopic compositions, unlike matter, which is produced presumably its chief progenitors, the supernova explosions. For example, it contained approximately 17 times more aluminum-26, a light isotope of this metal than the average for the Galaxy, and the proportion of heavy iron-60, in contrast, was abnormally low.

As noted by Dwarkadas, astronomers are trying to explain these differences is unlikely and very exotic scenarios of how the matter of the supernova could accumulate in the place of the birth of the Solar system, while «losing» iron-60. According to him, all these difficulties and conventions, you can get rid of if you change the «parent «of its matter in a very unusual class of stars, the so-called star wolf-Rayet, whose mass exceeds the sun in 40-50 times.

In our Galaxy and its satellites there are several thousand such stars, in the depths of which there is such a violent activity that they throw huge amounts of material in the form of solar wind. This matter forms a kind of «shaggy» gas mantle around the sun, which has a specific effect on their emission spectrum and other properties of these stars.

Within this «shaggy» mantle, as the calculations of Dwarkadas and his colleagues, there is a kind of bubble of gas and dust, which is an area of comparative emptiness, surrounded by a dense shell of gas and dust. The walls of this bubble, according to planetary scientists will «slow down» the movement of the relatively heavy dust particles, which include atoms of aluminum-26, which is produced in large quantities in the outer shells of the star wolf-Rayet.

In 5-6 million years, when the star-giant finishes his short life in a powerful supernova explosion, the matter of this «bubble» is partly dissipated to the surroundings and is transformed into a dense cloud of gas and dust, inside of which can be born new, smaller lights.

In this way, according to Dwarkadas and his colleagues were born the Sun and about one-sixth part of all the other stars in the Galaxy. This is supported by the fact that many of the «germ» of stars, known today astronomers located a short distance from the famous remains of a large white and blue giants, as well as within the «bubble of gas» left the dead bodies.

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