“Scientists have linked a mysterious class of repeating cosmic signals to a white dwarf star stealing material from a neighboring star. The breakthrough not only solves a long-standing astronomical puzzle but also provides a powerful new tool for understanding similar signals across the galaxy. (Artist’s concept.) Credit: SciTechDaily.com” (ScitechDaily, A Cannibal Star Finally Solves One of Astronomy’s Biggest Mysteries)
“A star caught feeding on its companion has finally revealed the source of some of the galaxy’s most mysterious repeating signals.”(ScitechDaily, A Cannibal Star Finally Solves One of Astronomy’s Biggest Mysteries)
An international research team led by scientists at the University of Sydney has uncovered the strongest evidence yet explaining the origin of a puzzling type of cosmic signal. Their work has also revealed a rare stellar system that offers a unique opportunity to study some of the most extreme conditions in the universe.
Cannibal stars are stars that pull matter from their companion. They can be normal stars, or white dwarfs, magnetars, neutron stars, or black holes. When the plasma bridge travels through the plasma layer. That forms radio waves. X-rays and gamma rays. Depending on the companion. The X-ray bursts from Cygnus X-1 uncovered the black hole in that system. Pulsars sometimes get their energy from matter.
That they pull out from other stars. And those events. They can be behind many repeating long-term radio transmissions. When a neutron star or black hole captures another star. That thing forms a situation. That the matter starts to flow to the gravity center. Cases like Sirius B. That is a white dwarf that orbits Sirius. The bright spectral class A star. There are discussions about the formation of Sirius B. Sometimes, astronomers say that at the beginning. The Sirius B was about 5 times heavier than the Sun.
But then Sirius A stole lots of matter. And that means that the Sirius B blew 4/5 of its mass into space or Sirius A. Today, Sirius B is about a solar-mass white dwarf. The size of that extremely dense object is about the same as Earth. The Sirius A age is about 225-250 million years. The age of Sirius B is about 228 million years.
“Accreting white dwarf illustration. Credit: Carl Knox (OzGrav, Swinburne University of Technology) and Joshua Preston Pritchard (CSIRO)” (ScitechDaily, A Cannibal Star Finally Solves One of Astronomy’s Biggest Mysteries)
“CSIRO ’s ASKAP radio telescope on Wajarri Yamaji Country. Credit: Alex Cherney.” (ScitechDaily, A Cannibal Star Finally Solves One of Astronomy’s Biggest Mysteries)
“The ASKAP radio telescope at Inyarrimanha Ilgari Bundara, the CSIRO Murchison Radio-astronomy Observatory on Wajarri Yamaji Country in Western Australia. Credit: Alex Cherney/CSIRO” (ScitechDaily, A Cannibal Star Finally Solves One of Astronomy’s Biggest Mysteries)
But some people say. That Sirius B is too light. And Sirius A is too young to have formed in the same nebula. It’s possible that Sirius B lost lots of matter. But the mass of Sirius A is about 2 times that of the Sun. So, in calculations, about 3/5 of the Sirius B mass “vanished” into space. When that star detonated in a nova eruption.
Or it should lose too much mass. They say that maybe Sirius A. A two-times as massive a star as the Sun. Captured that small white dwarf. They explain their opinion that Sirius B should turn into a black hole. Or a neutron star. And heavy elements on the surface of Sirius B.
They are from the nebula around Sirius A. Or in some other model. The Sirius B detonated as a nova. And that nova put the Sirius A into form. But those things are speculative. The only fact is that. There must be asteroids in the Sirius system. And sometimes some asteroids must hit the surface of Sirius B.
The bright star can hide its companion. But when the companion star travels through a massive plasma eruption. That can cause a situation. There, the eruption launches the radio signals. If that plasma hits the dwarf star’s surface,
But the universe is full of binary stars. There, the dwarf stars orbit. The red giants or some so-called main-sequence stars. In the cases that. Some dwarf stars orbit things like Wolf-Rayet stars. The dwarf can travel through the material eruptions of those stars. That can cause unexpected radio impulses.
https://scitechdaily.com/a-cannibal-star-finally-solves-one-of-astronomys-biggest-mysteries/
https://en.wikipedia.org/wiki/Sirius































