Runaway Star Fastest It Happen Due Supernova Explosions

Astronomy Science ~ fastest known star in our galaxy are on track to escape the Milky Way and new research shows that this star was kicked ...

Astronomy Science ~ fastest known star in our galaxy are on track to escape the Milky Way and new research shows that this star was kicked by a supernova explosion.

Breakout star of US 708, traveling at a speed of 7456 miles per second (12,000 km / s) - or about 26 million miles per hour (43 million km / h), thus making it a star in the Milky Way's fastest ever recorded by astronomers, according to new research. Speed ​​will enable it to escape the gravitational pull of the galaxy, and eventually made its way into intergalactic space.

A NASA animation shows hypervelocity star burst caused exploding stars, kicked him in the Milky Way.

Most of the other stars that move fast enough to get out of the galaxy is considered issued by supermassive black holes at the centers of galaxies, the researchers said. US 708 is the first breakout star with a different origin stories, and new research shows his more bizarre and chaotic.
Illustration
Illustration

Out Of The Galaxy

Our sun and most of the millions of stars in the Milky Way together orbits the galactic center with a speed of light: The sun we traveled about 125 miles per second, or 450,000 miles per hour. But there is a class called hypervelocity star, or HVS, which is moving at a speed high enough to escape the gravitational pull of the galaxy.

So far, the fastest hypervelocity star has recorded about 2 million miles per hour. But US 708 moves at a speed of more than 26 million miles per hour. "It is significantly faster," said Stephan Geier, a postdoctoral researcher at the European Southern Observatory and co-author on the new study.

Geier and colleagues first identified several US 708 in 2005. In this new study, he and his co-authors were able to measure the velocities of stars by using good data today and watch the changes in motion a total of about 70 years.

Monster black hole at the center of the Milky Way has a gravity muscles to throw stars on a one-way track and many other hypervelocity stars are thought to originate from there. But US 708 does not start its journey near the center of the galaxy, according to new research.

Based on the additional instructions, the scientists say it is probably orbiting another star when the track changes. US 708 and its stars probably orbit each other very quickly, and very small distance that separates them. Then the companion star that exploded into a supernova and completely destroyed. US 708 suddenly strapless gravity to remain in the same place, then all the rotational speed and energy suddenly started to move in a straight line.

"It's like if you take a swing, where you are connected with a chain, and you cut the chain - then you fly away from the swing," said Geier. "In this case the swing that exploded."

An Extraordinary Life For Stars

The researchers were not able to look back at what happened on US 708 before it was in position this time. But the clues they need is the physical characteristics and behavior of the current star.

Speed ​​is not the only thing that determines US 708 is different from other hypervelocity star. Prior to 2014, all detected HVS is a main sequence star, similar to our sun. Early that year, a group of hypervelocity stars are much bigger found (these stars also appear to come from the center of the galaxy). But US 708 instead of the main sequence, and it was not great; The type of star known as a hot subdwarf.

As the name suggests, hot subdwarfs small but has a very high temperature which indicates that they are never far greater. US 708 currently has a mass of about half the mass of our sun, but researchers say that the star before the possibility of a red giant with a mass two to three times that of our sun. The outer layer of the red giant hydrogen may be sucked by another nearby star, leaving little subdwarf star made mostly of helium.

Neighboring star that eats most likely a white dwarf: the collapsing star is no longer burning fuel. After consuming the outer layer of hydrogen from US 708, then starts sucking helium from US 708, which ultimately led to its demise.

Helium is extremely flammable, and when the white dwarf swallows more of this material, he continues to create a thick layer on its surface heat, helium is turned on. The theory shows that this buildup and then began kicking helium ignition combustion of carbon in stars, which then can lead to the destruction of the entire star, as in type 1a supernova explosion.

"White dwarfs is completely destroyed," said Geier.

Once again, the destruction of the white dwarf carries US 708 on the way out of the galaxy. The explosion itself likely contributes very little energy for the stars to leave the system, he said.

"This is probably one of the most dramatic life story of the star," said Geier.
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Astronomy Science: Runaway Star Fastest It Happen Due Supernova Explosions
Runaway Star Fastest It Happen Due Supernova Explosions
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