Astronomers recently discovered a white dwarf pulsar. It spins so fast, and they believe it can bring new information about the evolution of stars.
White Dwarf Pulsar And Evolution Of Stars
The white dwarf pulsar, which spins 300 times faster than Earth, may be able to shed some light on how these unusual objects produce strong magnetic fields, Space.com reported.
The unusual stellar remnant is rapidly spinning and, as it does so, hurls strong beams of electrical particles and radiation at a red dwarf companion star, causing the entire system to fade and brighten over predictable time intervals radically.
Although scientists are unsure of their origin, strong magnetic fields are thought to be the driving force behind this pulsar activity. One explanation is a scenario that says white dwarfs contain dynamos in their cores similar to those on Earth, though much more potent ones, which produce their magnetospheres. Studying the system might enable researchers to confirm this mechanism and learn more about the evolution of stars.
Ingrid Pelisoli, a researcher at the University of Warwick's Department of Physics, said in a statement that white dwarf stars are one type of object where the genesis of magnetic fields is a major unanswered subject in many areas of astronomy. The dynamo model helps to explain why the magnetic fields in white dwarfs can be a million times stronger than the magnetic field of the Sun. J1912-4410's discovery represented a significant advance in this area.
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What Are White Dwarfs?
After using up all of their nuclear fuel, stars like the Sun become white dwarfs. This kind of star expels most of its outer material as it nears the conclusion of its nuclear burning cycle, forming a planetary nebula, according to NASA.
The star's scorching core is all that is left. When this core reaches a temperature of more than 100,000 Kelvin, it turns into a very hot white dwarf. Over the following billion years, the white dwarf cools unless it is accreting material from a nearby star.
There are a lot of nearby young white dwarfs that have been identified as soft or lower-energy X-ray sources. Recent advances in soft X-ray and extreme ultraviolet observations have made them potent tools for studying the makeup and structure of these stars' thin atmospheres.
You can also put it this way, when stars with masses up to seven times bigger than the Sun run out of nuclear fuel and their cores are unable to resist gravitational collapse, white dwarfs are created.
The material that makes up the stellar outer shell expands to a width that can reach 100 times that of the progenitor star as the stellar cores of these stars collapse. This process is called the red giant phase. Over millions of years, the outer shell material spreads and disperses, and the core cools, leaving behind a star remnant known as a white dwarf.
In roughly 4.5 billion years, the Sun will go through this process, expanding to approximately the orbit of Mars and engulfing the inner planets, including Earth. Then, in a failing solar system, our star will die as a burning white dwarf.
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