{"id":7139,"date":"2017-03-01T08:23:17","date_gmt":"2017-03-01T08:23:17","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=7139"},"modified":"2017-03-07T06:58:56","modified_gmt":"2017-03-07T06:58:56","slug":"u-camelopardalis-letoile-crache-coquille-de-gaz","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/03\/01\/u-camelopardalis-letoile-crache-coquille-de-gaz\/","title":{"rendered":"U Camelopardalis, l’\u00e9toile qui crache une coquille de gaz"},"content":{"rendered":"

Photographi\u00e9e par le t\u00e9lescope Hubble, une immense bulle de gaz entoure U Camelopardalis<\/em>, une \u00e9toile en fin de vie dans la constellation de la Girafe.\u00a0<\/strong><\/p>\n

Situ\u00e9e en bordure de la Voie lact\u00e9e<\/a> \u00e0 proximit\u00e9 de l’\u00e9toile polaire<\/a>, entre Cassiop\u00e9e<\/a>, C\u00e9ph\u00e9e et le Cocher, la constellation bor\u00e9ale de la Girafe est tr\u00e8s discr\u00e8te : les \u00e9toiles qui la composent sont particuli\u00e8rement faibles, les plus brillantes se situant autour de la magnitude 4 (vous pouvez retrouver la constellation sur cette image<\/a>). Attardons-nous sur U Camelopardalis<\/em>, un astre de magnitude 7,35 sur lequel s’est pench\u00e9 le t\u00e9lescope spatial Hubble<\/a>.<\/p>\n

\"ucamelopardalis\"<\/a><\/p>\n

Cette \u00e9toile en fin de vie toussote r\u00e9guli\u00e8rement, soufflant dans l’espace une coquille de gaz riche en carbone, d’o\u00f9 le nom d’\u00e9toile carbon\u00e9e. \u00a0<\/p>\n

Les \u00e9toiles carbon\u00e9es\u00a0sont des \u00e9toiles g\u00e9antes rouges assez froides dont la temp\u00e9rature oscille g\u00e9n\u00e9ralement entre 2.000 et 3.000 K. Ces \u00e9toiles instables expulsent de temps en temps une coquille compos\u00e9e de gaz et de particules microscopiques carbon\u00e9es. \u00c0 chaque quinte de toux l’\u00e9toile peut perdre jusqu’\u00e0 la moiti\u00e9 de sa masse.<\/p>\n

Cette coquille est cependant tr\u00e8s t\u00e9nue. Pour r\u00e9v\u00e9ler dans ses moindres d\u00e9tails celle qui entoure U Camelopardalis<\/em>, le t\u00e9lescope spatial a effectu\u00e9 une pose longue, ce qui a pour cons\u00e9quence de surexposer l’\u00e9toile centrale. U Camelopardalis<\/em> pr\u00e9sente une coquille parfaitement sph\u00e9rique, ce qui n’est pas toujours le cas des \u00e9toiles en fin de vie, dont l’exemple le plus c\u00e9l\u00e8bre est Eta Carinae<\/em><\/a>, une \u00e9toile particuli\u00e8rement massive dans la constellation australe de la Car\u00e8ne.<\/p>\n","protected":false},"excerpt":{"rendered":"

Photographi\u00e9e par le t\u00e9lescope Hubble, une immense bulle de gaz entoure U Camelopardalis, une \u00e9toile en fin de vie dans la constellation de la Girafe.\u00a0 Situ\u00e9e en bordure de la Voie lact\u00e9e \u00e0 proximit\u00e9 de l’\u00e9toile polaire, entre Cassiop\u00e9e, C\u00e9ph\u00e9e et le Cocher, la constellation bor\u00e9ale de la Girafe est tr\u00e8s discr\u00e8te : les \u00e9toiles … Continuer la lecture de U Camelopardalis, l’\u00e9toile qui crache une coquille de gaz<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":7140,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[1863,2024,2025,98,544,2023],"class_list":["post-7139","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-constellation-de-la-girafe","tag-eta-carinae","tag-etoile-carbonee","tag-etoile-polaire","tag-telescope-spatial-hubble","tag-u-camelopardalis"],"yoast_head":"\nU Camelopardalis, l'\u00e9toile qui crache une coquille de gaz<\/title>\n<meta name=\"description\" content=\"Photographi\u00e9e par le t\u00e9lescope Hubble, une immense bulle de gaz entoure U Camelopardalis, une \u00e9toile en fin de vie dans la constellation de la Girafe.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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