Représentation d'une fusion d'étoile

Collisions of dead stars would give life to a new star

Numerous phenomena heavenly occur in the universe and many of them are unexplained to date. However, thanks to the relentless research that is being carried out, certain secrets of these extraordinary mechanisms have been unlocked. Recently, researchers have detected theone of these phenomena leading to the formation of new stars. This discovery overturns the knowledge acquired so far.

In fact, it would be stellar mechanisms between two dying stars which lead to the birth of a new star. Surprisingly, instead of destroying each other, these two dying heat balls associated to give life to a new star. Surprised, the scientists carried out simulations and made hypotheses.

Many scientists participated in the study, including Nicole Reindl, an astrophysicist from the University of Potsdam in Germany. The research results were published in the March monthly notices of the Royal Astronomical Society Letters.

Reconstruction of stellar events forming stars

Indeed, according to the researchers, these stars may have formed from the fusion of two white dwarfs, then the remaining celestial cores have exhausted their fuel. Then these experts assumed that one of the two is surely rich in helium and the other in carbon and in oxygen.

Also, these two white dwarfs would have passed each other before without touching each other, but at some point, gradually closer together over time. Finally, the white dwarf rich in helium at engulfed his partnerspewing carbon and oxygen all over its surface.

“Such a fusion would have produced a stellar body coated in carbon and oxygen with enough mass to kick-start nuclear fusion in its core, causing it to burn hot and glow brightly. »

Tiara Battich, astrophysicist at the Max Planck Institute for Astrophysics in Garching, Germany.

To test this hypothesis, the scientists simulated evolution, the death and the eventual merger of two stars. The team found that the accumulation of a carbon- and oxygen-rich white dwarf around a more massive helium star could explain the surface compositions of the two stars.

A rather rare event

Generally, the phenomena observed should not occur, because in most cases, the carbon-oxygen white dwarf should to cover oneself with that of helium. This event is explained, because carbon-oxygen white dwarfs are often the most massive.

Therefore, to observe this rare case of star formation, two stars slightly more massive than the sun should form at the good distance one from the other. Moreover, they should then have exchanged matter at the good time then run out of nuclear fuel in order to let the alchemy happen.

SOURCE: SCIENCE NEWS

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