Astronomers discovered the first pulsed white dwarf in the eclipsing binary system. Astronomers discovered the first pulsed white dwarf in the eclipsing binary system.
Astronomers have observed a pulsed white dwarf star for the binary star system SDSS J115219.99 + 024814.4 (SDSS J1152 + 0248 for short). Artist’s impression of two white dwarfs. Image by Mark Garlick / University of Warwick.
White dwarfs are the burned-out cores of stars like the Sun and the fate of 97% of the stars in our Milan galaxy.
The internal structure and structure of the white dwarfs are hidden by their high gravity.
Which makes all the elements settle their atmosphere in addition to the lightening. Most white dwarfs are believed to be composed primarily of carbon and oxygen.
But SDSS J1152 + 0248 includes white dwarfs, a 2.4-h binary system consisting of two low-mass white dwarfs, data from the Kepler / K2 mission. from NASA. It has been discovered using mainly helium.
Professor Vic Dhillon of the University of Sheffield and his colleagues said: We believe this is the result of rapidly ending the growth of its binary partner, before helium has a chance to fuse it into carbon and oxygen.
Astronomers used the SDSS J1152 + 0248 using the HighPreakCam, a revolutionary high-speed camera that can take a photo in five different colors every millisecond simultaneously, and 10.4- on the island of La Palma in the Canary Islands.
The meter is mounted on the Great Carias Telescope. Spain This allowed the researchers to detect faster and more subtle vibrations of a member of the system.
The vibrations of this 0.325-solar-mass white dwarf and receptive binary system allowed the team to investigate its structure using two techniques, asterisk and eclipse studies. Asterosismology involves measuring how fast sound waves travel through white dwarfs.
This diagram shows the SDSS binary system J115219.99 + 024814.4. (Center de Donnes Astronomers of Strasbourg / SIMBAD / DSS). This diagram shows the SDSS binary system J115219.99 + 024814.4. Image courtesy: Astronomers from the Strasbourg Donnes Center / SIMBAD / DSS.
“Determining what a white dwarf is made of is not easy because these objects comprise about half the mass of the Sun, packed in something the size of Earth,” said first author Dr. Steven Parsons also told the Sheffield University.
“This means that gravity is much stronger on a white dwarf, about a million times larger than here on Earth, so an average person would weigh about 60,000,000 kilograms on the surface of a white dwarf.”
“Gravity causes all of the heaviest elements of the white dwarf to sink to the center, leaving only the clearest elements on the surface, and therefore its true structure remains hidden underneath.”
He said, “We found that using white dwarfs is extremely important because we can use binary motion and an eclipse to independently measure the mass and radius of this white dwarf, which helps us determine if what it is made of,” he said.
“Even more interesting, the two stars in this binary system have interacted with each other in the past, transferring content from one side to the other.”
“We can see how this binary evolution has affected the internal structure of the white dwarf, something that we have not been able to do before for such binary systems.”
The discovery is reported in an article in the journal Nature Astronomy.
Astronomers discovered the first pulsed white dwarf in the eclipsing binary system. Astronomers at the University of Sheffield in Britain have discovered a peculiar binary system.
Where two white dwarfs, like the nucleus of stars that once passed the Sun, orbit each other. The pair of stars is a binary eclipse, which means that they are regularly traversed when viewed from Earth. In addition to that, one of them is pressing.
This configuration, never seen before, will allow a detailed study of white dwarfs and their composition. Thanks to the uniqueness of the system, as explained in Nature Astronomy, the team was able to estimate the mass and radius of two objects.
The radius of the pulsed star is 13,300 kilometers (8,300 miles) and the mass of the Sun is 32.5 percent. His partner carries a mass of 36.2 percent of the sun with a radius of 14,750 kilometers (9,200 miles).
The uncertainty about the radius is less than 300 kilometers (185 miles), which is incredibly accurate given that the system is 2,300 light years away.
“These white vibrations we have discovered are extremely important because we can use binary motion and an eclipse to independently measure the mass and radius of this white dwarf, which helps us determine.. what it is?
It is made of cheese, said the author. main, Dr. Steven Parsons. Even more interesting is that two stars in this binary system have interacted with each other in the past, moving material back and forth between them.
We can see how this binary evolution has affected the internal structure of the white dwarf, something that we have not been able to do before for this type of binary systems.
Astronomers have developed various techniques to study distant stars. In a binary eclipse, they use a two-star shift to verify their properties. Vibrations are, instead of the realm of asterisk science.
Which uses the movement of a sound wave through a star to study its interior. Since the system has both characteristics, the team has gained incredible insight into white dwarfs.
The team described the pulsed white dwarf as a benchmark for future research. While most white dwarfs are made of carbon and oxygen, it is particularly rich in helium.
This fact implies, according to scientists, that its development was shortened by its partner. Determining what a white dwarf is made of is not easy because these objects represent about half the mass of the Sun.
Which is packaged in something the size of Earth, Parsons explained. “This means that gravity is extremely strong on a white dwarf, about a million times larger than here on Earth.
So an average person would weigh about 60,000,000 kilograms on the surface of a white dwarf. The white dwarf by gravity it has all the heavy elements.
It causes subsidence in the center, leaving only the lightest elements on the surface, and therefore its true structure remains hidden underneath.
The team will continue to inspect this object using the HiPERCAM instrument and the Hubble Space Telescope.