{"id":2554,"date":"2015-04-25T18:05:40","date_gmt":"2015-04-25T18:05:40","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=2554"},"modified":"2015-05-31T08:03:37","modified_gmt":"2015-05-31T08:03:37","slug":"simeis-147-un-remanent-de-supernova-dans-le-taureau","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/04\/25\/simeis-147-un-remanent-de-supernova-dans-le-taureau\/","title":{"rendered":"Simeis 147, un r\u00e9manent de supernova dans le Taureau"},"content":{"rendered":"

Il y a environ 40 000 ans que s’est produite une explosion stellaire dans la constellation du Taureau (qui abrite \u00e9galement la n\u00e9buleuse du Crabe<\/a>) \u00e0 environ 3000 ann\u00e9es-lumi\u00e8re de nous. Une \u00e9toile \u00e0 l’agonie a litt\u00e9ralement vol\u00e9 en \u00e9clats dans un violent soubresaut, devenant particuli\u00e8rement lumineuse en m\u00eame temps qu’elle projetait sa mati\u00e8re dans l’espace.<\/p>\n

\"simeis_147_supernova_remanent_emil_ivanov\"<\/a><\/p>\n

400 si\u00e8cles plus tard il ne reste de cet astre qu’un pulsar, petit corps tr\u00e8s dense en rotation rapide sur lui-m\u00eame qui balaie l’espace de son rayonnement comme le fait un phare c\u00f4tier.<\/p>\n

Quant \u00e0 la mati\u00e8re expuls\u00e9e dans l’explosion elle a continu\u00e9 \u00e0 s’\u00e9tendre en se diluant au point de former aujourd’hui un r\u00e9seau complexe de filaments d’oxyg\u00e8ne et d’hydrog\u00e8ne qui sont illumin\u00e9s lors du passage de l’onde de choc g\u00e9n\u00e9r\u00e9e par la supernova.<\/p>\n

Cette n\u00e9buleuse s’\u00e9tend sur 150 ann\u00e9es-lumi\u00e8re, ce qui repr\u00e9sente un diam\u00e8tre apparent \u00e9quivalent \u00e0 six fois celui de la Pleine Lune<\/a> ! Un r\u00e9manent de cette taille ne n\u00e9cessite pas de gros t\u00e9lescope <\/a>pour \u00eatre photographi\u00e9 : il aura suffit d’un t\u00e9l\u00e9objectif de 300 millim\u00e8tres de focale pour que l’astrophotographe amateur Emil Ivanov<\/a> (un chanteur d’op\u00e9ra qui vit en Bulgarie) r\u00e9alise cette image.<\/p>\n

Mais comme Simeis 147<\/a> est un objet c\u00e9leste particuli\u00e8rement discret, pr\u00e8s de 50 heures de poses cumul\u00e9es avec diff\u00e9rents filtres au cours de l’hiver 2010-2011 ont \u00e9t\u00e9 n\u00e9cessaires pour en r\u00e9v\u00e9ler la beaut\u00e9 et la finesse.<\/p>\n","protected":false},"excerpt":{"rendered":"

Il y a environ 40 000 ans que s’est produite une explosion stellaire dans la constellation du Taureau (qui abrite \u00e9galement la n\u00e9buleuse du Crabe) \u00e0 environ 3000 ann\u00e9es-lumi\u00e8re de nous. Une \u00e9toile \u00e0 l’agonie a litt\u00e9ralement vol\u00e9 en \u00e9clats dans un violent soubresaut, devenant particuli\u00e8rement lumineuse en m\u00eame temps qu’elle projetait sa mati\u00e8re dans … Continuer la lecture de Simeis 147, un r\u00e9manent de supernova dans le Taureau<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":2555,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[132,968,788,399,967,403],"class_list":["post-2554","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-constellation-du-taureau","tag-emil-ivanov","tag-onde-de-choc","tag-pulsar","tag-simeis-147","tag-supernova"],"yoast_head":"\nSimeis 147, un r\u00e9manent de supernova dans le Taureau<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/04\/25\/simeis-147-un-remanent-de-supernova-dans-le-taureau\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Simeis 147, un r\u00e9manent de supernova dans le Taureau\" \/>\n<meta property=\"og:description\" content=\"Il y a environ 40 000 ans que s’est produite une explosion stellaire dans la constellation du Taureau (qui abrite \u00e9galement la n\u00e9buleuse du Crabe) \u00e0 environ 3000 ann\u00e9es-lumi\u00e8re de nous. 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