An unusual ultra massive white dwarf with bizarre carbon rich atmosphere, A massive white dwarf with a strange atmosphere rich in carbon could be two white dwarfs merged together, and only narrowly avoided destruction.
They found an extraordinary large white dwarf about 150 light years from us, with an atmospheric composition that had never been seen before when the fused white dwarf was first identified by its atmospheric composition as a clue.
This star, named WDJ0551 + 4135, was identified when examining data from the European Space Agency’s Gaia telescope.
Astronomers follow spectroscopy with the William Herschel telescope, which focuses on white dwarfs which according to Guy’s mission are very powerful.
By breaking down the light emitted by stars, astronomers can identify the chemical composition of the atmosphere and find that it has an unusually high carbon content.
White dwarfs are the remnants of a star like our sun, which burns all its fuel and throws its outer layers.
Most are relatively light, around 0.6 times the mass of our sun, but weighing 1.14 solar masses, almost twice the average mass. Even though it is heavier than our sun, it is compressed by two thirds of the Earth’s diameter. An unusual ultra massive white dwarf with bizarre carbon rich atmosphere.
The age of the white dwarf is also an indication. Older stars move through the Milky Way faster than younger stars, and this object moves faster than 99% of other nearby white dwarves with the same cooling age, indicating that this star is older than him. it looks like.
We have a composition that cannot be explained by the evolution of normal stars, masses that are twice the average white dwarf, and kinematic ages that are older than those obtained from cooling, the researchers said.
We are almost sure how stars form white dwarfs and shouldn’t. The only way to explain this is that it was created by combining two white dwarfs.
The theory is that in the binary system, when a star expands at the end of its lifetime, it embraces its partner and approaches its orbit when the first star shrinks.
The same thing happens when other stars expand. Over billions of years, the emission of gravitational waves will reduce orbits in such a way that the stars join one another. An unusual ultra massive white dwarf with bizarre carbon rich atmosphere.
As long as the fusion of white dwarfs is expected, this will be very unusual. Most of the mergers in our galaxy will occur between stars of different masses, while this fusion appears to be between two stars of the same size.
There is also a white dwarf size limit that can be obtained: with more than 1.4 solar masses, it is assumed to explode into a supernova, although this explosion can occur at a slightly lower mass. Stars are useful for showing how large white dwarfs can and still survive.
Because the fusion process resumed star cooling, it is difficult to determine how old it is.
White dwarfs might have joined about 1.3 billion years ago, but two original white dwarfs might have existed billions of years ago.
There aren’t many white dwarfs that big, although there are more than you would expect, indicating that some of them might have been created through mergers.
“In the future, we might be able to use a technique called asteroseismology to study the basic composition of white dwarfs from their star waves. This will be an independent way to confirm the stars that formed this fusion. An unusual ultra massive white dwarf with bizarre carbon rich atmosphere.
Perhaps the most interesting aspect of this star is that it hardly has to explode as a supernova. This giant explosion is very important to map the structure of the universe.
However, it is still very uncertain what kind of star system reaches the supernova scene. As strange as it sounds, measuring these “failed” supernova properties and future similarities speak volumes about the path to self-destruction of thermonuclear.