Luminous Blue Variable Stars
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Luminous Blue Variable Stars: Eta Carinae

Luminous Blue Variable Stars: Eta Carinae


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Purchase includes free access to book updates online and a free trial membership in the publisher's book club where you can select from more than a million books without charge. Excerpt: Eta Carinae - Wikipedia, the free encyclopedia This stellar system is currently one of the most massive that can be studied in great detail. Until recently, Eta Carinae was thought to be the most massive single star, but it was recently demoted to a binary system. The most massive star in the Eta Carinae multiple star system has less than 100 times the mass of the Sun. Other known massive stars are more luminous and more massive. Stars in the mass class of Eta Carinae, with more than 100 times the mass of the Sun, produce more than a million times as much light as the Sun. They are quite rare only a few dozen in a galaxy as big as the Milky Way. They are assumed to approach (or potentially exceed) the Eddington limit, i.e., the outward pressure of their radiation is almost strong enough to counteract gravity. Stars that are more than 120 solar masses exceed the theoretical Eddington limit, and their gravity is barely strong enough to hold in their radiation and gas. Eta Carinae's chief significance for astrophysics is based on its giant eruption or supernova impostor event, which was observed around 1843. In a few years, Eta Carinae produced almost as much visible light as a supernova explosion, but it survived. Other supernova impostors have been seen in other galaxies, for example the false supernovae SN 1961v in NGC 1058 and SN 2006jc in NGC 4904, which produced a false supernova, noted in October 2004. Significantly, SN 2006jc was destroyed in a supernova explosion two years later, observed on October 9, 2006. The supernova impostor phenomenon may represent a surface instability or a failed supernova. Eta Carinae's giant eruption was the prototype for this phenomenon, and after 160 years the star's internal structure has not fully recovere... More: http://booksllc.net/?id=92385


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Product Details
  • ISBN-13: 9781156280973
  • Publisher: Books LLC
  • Publisher Imprint: Books LLC
  • Height: 152 mm
  • No of Pages: 38
  • Spine Width: 2 mm
  • Weight: 68 gr
  • ISBN-10: 1156280974
  • Publisher Date: 31 May 2010
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Sub Title: Eta Carinae
  • Width: 229 mm


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