Toile Wolf-Rayet
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Home > Art, Film & Photography > Toile Wolf-Rayet: IC 10 X-1, Gamma Velorum, Wr 20a, P Cygni
Toile Wolf-Rayet: IC 10 X-1, Gamma Velorum, Wr 20a, P Cygni

Toile Wolf-Rayet: IC 10 X-1, Gamma Velorum, Wr 20a, P Cygni


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About the Book

Les achats comprennent une adhsion l'essai gratuite au club de livres de l'diteur, dans lequel vous pouvez choisir parmi plus d'un million d'ouvrages, sans frais. Le livre consiste d'articles Wikipedia sur: Ic 10 X-1, Gamma Velorum, Wr 20a, P Cygni. Non illustr. Mises jour gratuites en ligne. Extrait: Une toile Wolf-Rayet (souvent abrg en toile WR) est une toile chaude, massive et volue prsentant un taux de perte de masse trs lev. Elles furent dcouvertes en 1867 par Charles Wolf et Georges Rayet, de l'Observatoire de Paris. Wolf et Rayet avaient observ, dans 3 toiles de la constellation du Cygne, d'tranges raies en mission d'origine alors inconnue. On pense aujourd'hui que les toiles Wolf-Rayet sont les descendantes des toiles de type spectral O ou B, c'est--dire les toiles les plus massives des populations stellaires (qui ont une masse comprise entre 9 et 80-150 masses solaires). On parle d'une toile Wolf-Rayet pour dire une toile de type Wolf-Rayet, plutt qu'une toile de Wolf-Rayet (comme on parle de l' toile de Barnard ). Les toiles Wolf-Rayet sont des toiles qui ne sont, en grande majorit, plus sur la squence principale, c'est--dire que la combustion qui se droule dans leur cur est la combustion de l'hlium (puis plus tard celle du carbone, puis de l'oxygne etc.), et non plus celle de l'hydrogne (comme c'est le cas des toiles sur la squence principale justement - voir le diagramme de Hertzsprung-Russell). En fait, on parle plus souvent du stade (volutif) Wolf-Rayet, ou d'une toile montrant des caractristiques Wolf-Rayet. D au fait que l'toile possde un vent stellaire important, tellement important que le vent est optiquement pais, cela n'a pas de sens de parler de surface (hydrostatique) de l'toile comme c'est le cas d'toiles normales, de plus faible masse, comme le Soleil. MM. Wolf et Rayet dcrivent ainsi leur dcouverte: (Comptes rendus de l'Acadmi...http: //booksllc.net/?l=fr


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Product Details
  • ISBN-13: 9781159994648
  • Publisher: Books LLC
  • Publisher Imprint: Books LLC
  • Height: 152 mm
  • No of Pages: 26
  • Spine Width: 2 mm
  • Weight: 50 gr
  • ISBN-10: 1159994641
  • Publisher Date: 08 Aug 2010
  • Binding: Paperback
  • Language: French
  • Returnable: N
  • Sub Title: IC 10 X-1, Gamma Velorum, Wr 20a, P Cygni
  • Width: 229 mm


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