{"id":10024,"date":"2019-03-14T05:15:49","date_gmt":"2019-03-14T05:15:49","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=10024"},"modified":"2019-03-27T20:08:07","modified_gmt":"2019-03-27T20:08:07","slug":"westerlund-1-lamas-detoiles-qui-intrigue-les-astronomes","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/03\/14\/westerlund-1-lamas-detoiles-qui-intrigue-les-astronomes\/","title":{"rendered":"Westerlund 1, l’amas d’\u00e9toiles qui intrigue les astronomes"},"content":{"rendered":"

Plusieurs instruments viennent de fournir une image in\u00e9dite d’un amas, Westerlund 1, dont certaines \u00e9toiles pr\u00e9sentent de curieuses queues.<\/strong><\/p>\n

Westerlund 1 (connu \u00e9galement sous le matricule ESO 277-12) est un jeune amas ouvert (son \u00e2ge est estim\u00e9 \u00e0 3 millions d’ann\u00e9es) compos\u00e9 d’environ 200.000 \u00e9toiles et situ\u00e9 \u00e0 presque 15.000 ann\u00e9es-lumi\u00e8re dans la constellation australe de l’Autel. Il a \u00e9t\u00e9 d\u00e9couvert en 1961 par\u00a0Bengt Westerlund, un astronome su\u00e9dois sp\u00e9cialis\u00e9 dans l’\u00e9tude des populations stellaires et des Nuages de Magellan<\/a>.<\/p>\n

\"\"<\/a>
Westerlund 1 est un amas d’\u00e9toiles situ\u00e9 dans la constellation de l’Autel. \u00a9 ESO\/ALMA<\/figcaption><\/figure>\n

Pour sonder ce groupe d’\u00e9toiles, l’un des plus massifs et des plus jeunes que l’on peut observer dans la Voie lact\u00e9e<\/a>, les astronomes de l’Observatoire Europ\u00e9en Austral (ESO<\/a>) ont combin\u00e9 les donn\u00e9es fournies par deux instruments : ALMA<\/a>,\u00a0(Atacama Large Millimeter\/submillimeter Array<\/em>), un observatoire radiomillim\u00e9trique et submillim\u00e9trique install\u00e9 \u00e0 plus de 5.000 m\u00e8tres d\u2019altitude sur le plateau de Chajnantor dans le d\u00e9sert d’Atacama<\/a> au Chili, et le t\u00e9lescope spatial Hubble<\/a>.<\/p>\n

Le r\u00e9sultat de cette combinaison de donn\u00e9es a de quoi surprendre : certaines des \u00e9toiles rouges massives qui composent l’amas pr\u00e9sentent des tra\u00een\u00e9es de mat\u00e9riaux qui \u00e9voquent celles que l’on observe habituellement derri\u00e8re les com\u00e8tes.<\/p>\n

\"\"<\/a>
Les antennes d’ALMA sont install\u00e9es dans le d\u00e9sert d’Atacama au Chili. \u00a9 ESO<\/figcaption><\/figure>\n

Quand nous avons la chance de pouvoir admirer une belle com\u00e8te qui passe \u00e0 proximit\u00e9 de la Terre (comme Hyakutake<\/a> en 1996 ou Hale-Bopp<\/a> l’ann\u00e9e suivante), nous sommes toujours impressionn\u00e9s par la queue qu’elle d\u00e9ploie ; nous savons qu’il s’agit de particules solides et gazeuses \u00e9chapp\u00e9es du noyau com\u00e9taire et repouss\u00e9es \u00e0 l’oppos\u00e9 du Soleil<\/a> par le vent solaire.<\/p>\n

Les astronomes pensent que c’est un ph\u00e9nom\u00e8ne similaire que l’on observe dans l’amas Westerlund 1 : les \u00e9toiles chaudes\u00a0nich\u00e9es au c\u0153ur de l’amas laissent \u00e9chapper de puissants vents stellaires qui repoussent les mat\u00e9riaux pr\u00e9sents dans le voisinage de certaines \u00e9toiles rouges situ\u00e9es en bordure de l’amas,\u00a0comme Westerlund 1-26, une hyperg\u00e9ante 1.500 fois plus grosse que le Soleil !<\/p>\n","protected":false},"excerpt":{"rendered":"

Plusieurs instruments viennent de fournir une image in\u00e9dite d’un amas, Westerlund 1, dont certaines \u00e9toiles pr\u00e9sentent de curieuses queues. Westerlund 1 (connu \u00e9galement sous le matricule ESO 277-12) est un jeune amas ouvert (son \u00e2ge est estim\u00e9 \u00e0 3 millions d’ann\u00e9es) compos\u00e9 d’environ 200.000 \u00e9toiles et situ\u00e9 \u00e0 presque 15.000 ann\u00e9es-lumi\u00e8re dans la constellation australe … Continuer la lecture de Westerlund 1, l’amas d’\u00e9toiles qui intrigue les astronomes<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":10025,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[1048,2617,1735,633,544,2616],"class_list":["post-10024","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-alma","tag-bengt-westerlund","tag-constellation-de-lautel","tag-eso","tag-telescope-spatial-hubble","tag-westerlund-1"],"yoast_head":"\nWesterlund 1, l'amas d'\u00e9toiles qui intrigue les 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