{"id":13318,"date":"2021-02-24T17:42:37","date_gmt":"2021-02-24T17:42:37","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=13318"},"modified":"2021-03-12T16:43:21","modified_gmt":"2021-03-12T16:43:21","slug":"un-systeme-stellaire-triple-se-cache-dans-la-nebuleuse-du-crane","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/02\/24\/un-systeme-stellaire-triple-se-cache-dans-la-nebuleuse-du-crane\/","title":{"rendered":"Un syst\u00e8me stellaire triple se cache dans la n\u00e9buleuse du Cr\u00e2ne"},"content":{"rendered":"<p><strong>Nich\u00e9e dans la constellation de la Baleine, la myst\u00e9rieuse n\u00e9buleuse du Cr\u00e2ne a la particularit\u00e9 d&#8217;h\u00e9berger un syst\u00e8me stellaire triple.<\/strong><\/p>\n<h5>Carte d&#8217;identit\u00e9 :<\/h5>\n<p>C&#8217;est \u00e0 l&#8217;infatigable <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/05\/12\/telescope-william-herschel\/\" target=\"_blank\" rel=\"noopener\">William Herschell<\/a> que l&#8217;on doit la d\u00e9couverte le 27 novembre 1785 de la n\u00e9buleuse du Cr\u00e2ne. Cette n\u00e9buleuse plan\u00e9taire est enregistr\u00e9e en 246e position dans\u00a0l\u2019imposant\u00a0<em>New General Catalogue of Nebulae and Clusters of Stars<\/em> qui regroupe pr\u00e8s de 8.000 objets du ciel profond. <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/12\/09\/patrick-moore-le-gentleman-de-lastronomie-britannique\/\" target=\"_blank\" rel=\"noopener\">Patrick Moore, le gentleman de l&#8217;astronomie britannique<\/a>, lui a \u00e9galement fait une place dans son catalogue sous l&#8217;appellation Caldwell 56.<\/p>\n<figure id=\"attachment_13321\" aria-describedby=\"caption-attachment-13321\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/01\/mira.jpg\" rel=\"lightbox[13318]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-13321\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/01\/mira-450x254.jpg\" alt=\"\" width=\"450\" height=\"254\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/01\/mira-450x254.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/01\/mira.jpg 700w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-13321\" class=\"wp-caption-text\">La constellation de la Baleine h\u00e9berge notamment la c\u00e9l\u00e8bre \u00e9toile variable Mira Ceti.<\/figcaption><\/figure>\n<p>NGC 246 est \u00e0 rechercher dans la Baleine (<em>Cetus<\/em>), une discr\u00e8te constellation rendue c\u00e9l\u00e8bre par la pr\u00e9sence d&#8217;une \u00e9toile variable \u00e9tonnante, <a href=\"https:\/\/www.futura-sciences.com\/sciences\/definitions\/astronomie-mira-ceti-6653\/\" target=\"_blank\" rel=\"noopener\"><em>Mira Ceti<\/em><\/a>. La n\u00e9buleuse, de <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/05\/06\/quest-lechelle-magnitudes-astronomie\/\" target=\"_blank\" rel=\"noopener\">magnitude<\/a> 10, se situe \u00e0 1.600 ann\u00e9es-lumi\u00e8re de la Terre.<\/p>\n<p><!--more--><\/p>\n<h5>Deux, puis trois \u00e9toiles :<\/h5>\n<p>Les observations men\u00e9es aux XIXe et XXe si\u00e8cles nous ont permis de d\u00e9crire le c\u0153ur de la n\u00e9buleuse. On y trouve un couple stellaire dont le membre le moins brillant est une naine blanche, HIP 3678. Cette \u00e9toile mourante, qui ressemblait \u00e0 notre Soleil il y a tr\u00e8s longtemps, a expuls\u00e9 ses couches externes \u00e0 l&#8217;origine de cette bulle de gaz. L&#8217;image ci-dessous nous est propos\u00e9e par l&#8217;<a href=\"https:\/\/www.eso.org\/public\/france\/news\/eso2019\/\" target=\"_blank\" rel=\"noopener\">ESO<\/a> :<\/p>\n<figure id=\"attachment_13319\" aria-describedby=\"caption-attachment-13319\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/01\/eso.jpg\" rel=\"lightbox[13318]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-13319\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/01\/eso-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/01\/eso-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/01\/eso-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/01\/eso-768x461.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/01\/eso.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-13319\" class=\"wp-caption-text\">La n\u00e9buleuse plan\u00e9taire du Cr\u00e2ne se situe dans la constellation de la Baleine. \u00a9 ESO<\/figcaption><\/figure>\n<p>En 2014, la puissance du <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/01\/17\/vlt-observatoire-desert-atacama\/\" target=\"_blank\" rel=\"noopener\"><em>Very Large Telescope<\/em><\/a> a r\u00e9v\u00e9l\u00e9 un troisi\u00e8me astre, une tr\u00e8s discr\u00e8te <a href=\"https:\/\/www.futura-sciences.com\/sciences\/definitions\/astronomie-naine-rouge-31\/\" target=\"_blank\" rel=\"noopener\">naine rouge<\/a>.\u00a0 Imaginez la danse macabre qui se d\u00e9roule au c\u0153ur de la n\u00e9buleuse : les deux naines tournent l&#8217;une autour de l&#8217;autre et la troisi\u00e8me \u00e9toile orbite autour de ce couple moribond !<\/p>\n<h5>\u00c0 savoir :<\/h5>\n<p>Les n\u00e9buleuses plan\u00e9taires n\u2019ont rien \u00e0 voir avec les plan\u00e8tes. Ces nuages cosmiques ont \u00e9t\u00e9 appel\u00e9s plan\u00e9taires parce qu\u2019ils paraissaient ronds \u00e0 travers les premiers t\u00e9lescopes. Les observations r\u00e9centes ont montr\u00e9 qu\u2019en r\u00e9alit\u00e9 cette coquille est circulaire dans moins de 20% des cas. Nous savons qu\u2019il y a des \u00e9toiles mourantes au centre de ces n\u00e9buleuses. C\u2019est l\u2019astre moribond qui a cr\u00e9\u00e9 cette coquille en soufflant ses couches externes. Les astronomes ont toujours su que ces n\u00e9buleuses \u00e9taient temporaires. Ils pensaient \u00e0 juste titre qu\u2019elles s\u2019estomperaient au fil du temps.<\/p>\n<figure id=\"attachment_13082\" aria-describedby=\"caption-attachment-13082\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/12\/nebul.jpg\" rel=\"lightbox[13318]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-13082\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/12\/nebul-450x225.jpg\" alt=\"\" width=\"450\" height=\"225\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/12\/nebul-450x225.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/12\/nebul-1024x512.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/12\/nebul-768x384.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/12\/nebul-1536x768.jpg 1536w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/12\/nebul.jpg 1800w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-13082\" class=\"wp-caption-text\">La m\u00e9tamorphose rapide de la n\u00e9buleuse plan\u00e9taire Hen 3-1357. \u00a9 NASA\/ESA<\/figcaption><\/figure>\n<p>Ils \u00e9taient loin d\u2019imaginer que deux d\u00e9cennies seulement suffiraient \u00e0 montrer ces transformations. C\u2019est ce qu&#8217;ont r\u00e9v\u00e8l\u00e9 les images de <a href=\"https:\/\/www.nasa.gov\/feature\/goddard\/2020\/hubble-captures-unprecedented-fading-of-stingray-nebula\" target=\"_blank\" rel=\"noopener noreferrer\">Hen 3-1357<\/a>\u00a0r\u00e9alis\u00e9es par le t\u00e9lescope Hubble en 1996 et 2016.<\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/01\/20\/moisson-de-nebuleuses-planetaires-pour-deux-amateurs\/\" target=\"_blank\" rel=\"noopener\">Moisson de n\u00e9buleuses plan\u00e9taires pour deux amateurs<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/11\/09\/zoom-letonnante-nebuleuse-planetaire-dumbbell\/\" target=\"_blank\" rel=\"noopener\">Zoom sur l&#8217;\u00e9tonnante n\u00e9buleuse plan\u00e9taire Dumbbell<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/06\/27\/messier-97-nebuleuse-planetaire-hibou\/\" target=\"_blank\" rel=\"noopener\">Messier 97, la n\u00e9buleuse plan\u00e9taire du Hibou<\/a><\/li>\n<\/ul>\n<p>Suivez l\u2019actualit\u00e9 astronomique en vous abonnant \u00e0 Cielmania sur\u00a0<a href=\"https:\/\/www.facebook.com\/cielmania\/\" target=\"_blank\" rel=\"noopener noreferrer\">Facebook<\/a>\u00a0ou\u00a0<a href=\"https:\/\/twitter.com\/cielmania\" target=\"_blank\" rel=\"noopener noreferrer\">Twitter<\/a>.<\/p>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>Nich\u00e9e dans la constellation de la Baleine, la myst\u00e9rieuse n\u00e9buleuse du Cr\u00e2ne a la particularit\u00e9 d&#8217;h\u00e9berger un syst\u00e8me stellaire triple. Carte d&#8217;identit\u00e9 : C&#8217;est \u00e0 l&#8217;infatigable William Herschell que l&#8217;on doit la d\u00e9couverte le 27 novembre 1785 de la n\u00e9buleuse du Cr\u00e2ne. Cette n\u00e9buleuse plan\u00e9taire est enregistr\u00e9e en 246e position dans\u00a0l\u2019imposant\u00a0New General Catalogue of Nebulae &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/02\/24\/un-systeme-stellaire-triple-se-cache-dans-la-nebuleuse-du-crane\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Un syst\u00e8me stellaire triple se cache dans la n\u00e9buleuse du Cr\u00e2ne<\/span>  <span class=\"meta-nav\">&rarr;<\/span><\/a><!-- AddThis Advanced Settings generic via filter on get_the_excerpt --><!-- AddThis Share Buttons generic via filter on get_the_excerpt --><\/p>\n","protected":false},"author":8,"featured_media":13319,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[2969,2967,2966,2968],"class_list":["post-13318","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-caldwell-56","tag-constellation-de-la-baleine","tag-nebuleuse-du-crane","tag-ngc-246"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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