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Post at: Jan 14 2022

Fastest-Spinning White Dwarf Star

Why in News?

  • Recently, a team of astronomers have confirmed that full rotation once in 25 seconds is the fastest spinning white dwarf star JO240 + 1952.

What is a White Dwarf Star?

  • White dwarf stars, co called because of the white colour of the first few that were discovered, are characterized by low luminosity.
  • It’s mass is comparable to that of the sun, while its volume is comparable to that of the Earth.
  • Because of their large mass and small dimensions, such stars are dense and compact objects with average densities approaching 1,000,000 times that of water.
  • It is a start that has burnt up all of its fuel and she its outer layers, now undergoing a process of shrinking and cooling over millions of years.
  • They have medium to high mass and are the find evolutionary state of stars whose mass is not high enough to become a neutron star.
  • The materials in a white dwarf star can no longer undergo fusion reactions, so the star has no source of energy.

About white dwarf star JO240+1952

  • The astronomers have shown that it is an extremely rare example of a magnetic propeller system.
  • It is located 2.016 light-years away in the constellation of Aries.
  • According to astronomers, it is part of a binary star system; its immense gravity is pulling gaseous plasma from a nearly comparison star and flinging it into space at around 3,000 kilometers per second.
  • It is only the second magnetic propeller white dwarf to have been identified in over 70 years.
  • It is almost 20% faster than the confirmed white dwarf with the most comparable spin rate, which completes a rotation in first over 29 seconds.
  • This dwarf star is also named as—

LAMOST J024048.51 + 195226.9.

Study regarding white dwarf star

  • The study was conducted by the University of Warnsick with the University of Sheffield.
  • It was published in the journal Monthly Notices of the Royal Astronomical Society : Letters.

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