The 'vampires' hide in the universe

Green wandering stars are called vampires in the universe because they specialize in "sucking blood" other stars to extend their life.

According to Discovery News, research published by scientists at the University of Wisconsin - Madison, USA, recently published in the journal Astrophysics clarifies the true parasitic nature of vampire stars.

The birth of the star begins when the dense clouds of gas between the stars break under the force of gravity. These clouds often have enough hydrogen to form many stars like a nursery. When fusion is activated in the core of stellar nuclei, stars grow at nearly the same rate and form a cluster.

Over time, the hydrogen source gradually depleted and the stars grew older. Finally, they will die as a supernova (collapsing into the mind under the influence of gravity to a certain density and pressure causing an explosion). If there is a mass similar to the Sun, they will swell to a red giant, eventually burning off most of the plasma energy, becoming a concentrated inert core under the influence of gravity, called a white dwarf .

Astronomers can track the maturation process of a major sequence of stars by measuring brightness relative to its color. Through applying the Hertzsprung Russell chart, they can obtain information about the mass, temperature and age of the stars. Basically, young stars are usually bright, blue and hot, while older stars are often dim, red and cold.

Green star wandering is born when a star in binary star system absorbs matter from the other star to enlarge.(Photo: NASA / ESA).

The evolutionary model becomes complicated when scientists observe some fairly old star clusters containing unusual young stars. These young blue stars cannot normally appear in red star populations. In addition, there are no floating gas clouds around them, making the existence of wandering blue stars glowing brightly in the old stars.

Researchers suspect wandering green stars are not original, but rejuvenated . In other words, they are old stars who know how to slow the natural evolution and even turn back the evolutionary time of the universe.

Most stars in the galaxy are not as solitary as the Sun. About half of the stars form close-up gravity from its inception, creating a binary star system, where each star grows in the gravitational field of another star. Half the binary star system is so close to each other that matter can go from one star to another easily. The gravitational field of a larger star can steal superheated plasma from a small star. Sometimes the binary star's trajectory shrinks, making the two stars unite as one.

When merged, the two stars collided with each other to form a larger young star with a bright green color. In the new study, astronomers focused on the emission of wandering blue stars to show it is a vampire star.

Through observations from the Hubble Space Telescope, the researchers headed by Robert Mathieu of the University of Wisconsin - Madison, found radiation from a wandering blue star containing information about its parasitic past. The star they observed was about 5,500 light-years from Earth and at first it seemed to be a single star. After analyzing the emission spectrum carefully, scientists found that this is actually a binary star system . Its little brother star is an ancient white dwarf.

From the understanding of binary star systems that have orbits close to each other, it is possible that the larger blue wandering star begins to "suck" the star's plasma energy, gradually increasing its own mass, becoming Younger and hotter star. Finally, the "victim" star is just a tiny white dwarf that loses its energy like fossil skeletons.

The physical nature behind the binary interaction of binary stars and the presence of wandering blue stars is an important part of understanding the evolution of stars that make up 25% of the total number of stars in the band. Galaxy. Research shows that some of them are not as young as they seem.