J0023 + 0307, ​​the Poorest Metal Star in the Milky Way

Universay – A group of Spanish astronomers recently discovered a primitive star with a low metal content. With SDSS J0023 + 0307, ​​this star appears to be one of the poorest metal stars in the Galaxy ever.

This small primitive star is located in the galaxy (halo) region of the galaxy and in reality does not differ as much from the appearance as the other stars around it. However, after extensive research with spectroscopic observations, it is known that it contains no carbon (one of the heavy elements called metal).

This star is considered very strange. Although it is strange that the astronomers who discovered and investigated it said that this star “should not exist”.

Thanks to the observation, the star J0023 + 0307 is actually rich in lithium, which is unusual for the very old stars. According to astronomers, J0023 + 0307 was formed around 300 million years after the Big Bang, immediately after the death of the first generation of stars in the universe.

“This primitive star surprises us because of the high lithium content and the possibility of a close relationship with the formed in the Big Bang old Lithium,” the responsible astronomer David Aguado of Cambridge University said the study.

When the universe was created 13.8 billion years ago, it was only filled with the lightest elements such as hydrogen, helium and a small amount of lithium and beryllium. These elements consist of neutrons, protons, electrons, positrons, photons and old neutrinos that appeared shortly after the Big Bang at the time of the big bang nucleosynthesis.

Heavier elements only entered the stomachs of the first stars a few million years later. When the first generation of stars died, they spread their content throughout the universe. The elements they had previously formed became the material needed to form new stars.

Astronomers mention all these heavy metal elements. If a star does not contain many heavy elements or if it is called a star of very bad metal, this is the sign that they were formed in the universe before the existence of these heavy elements in the universe.

Bintang J0023 + 0307 has less than a thousandth metal than that of the sun. However, it was originally believed that this star had formed when there were already heavy elements in the universe. Hemm, how are you?

To find the answer, these astronomers also studied the lithium content of J0023 + 0307. This star is known to contain lithium in a ratio roughly equal to that of other average metal stars that were never found.

“The lithium content of this primitive star is similar to other poor metal stars in the region of our galaxy,” astronomer Jonay González Hernández said of the Instituto de Astrofísica de Canarias in Spain astronomers study.

In normal stars, temperatures up to 2.5 million Kelvin are sufficient to cause hydrogen fusion in the central zone, which also destroys lithium content.

Well, astronomers seem to have discovered that a bad metal star does not burn as hot as a normal star with a higher metal content. This means that the lithium in the poor metal stars is actually the lithium that they have been from the beginning of their formation.

The lithium content of the stars J0023 + 0307 is probably from the era of the big bang nucleosynthesis. This star did not form after the death of the first generation of stars, but in the last life of the first generation of stars, a sort of final border of the Kernelaza of the Big Bang.

J0023 + 0307 appears to be a living fossil of the stars of the first generation of the universe. By learning it, we can also study the beginnings of the formation of this vast universe.

Learning stars can be just as interesting, right?

You can read the results of this study in its entirety through scientific articles published in Astrophysical Journal Letters.

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