{"id":19044,"date":"2024-05-08T16:09:16","date_gmt":"2024-05-08T16:09:16","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=19044"},"modified":"2024-05-22T16:31:01","modified_gmt":"2024-05-22T16:31:01","slug":"une-curieuse-nebuleuse-dentelee-dans-persee","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2024\/05\/08\/une-curieuse-nebuleuse-dentelee-dans-persee\/","title":{"rendered":"Une curieuse n\u00e9buleuse dentel\u00e9e dans Pers\u00e9e"},"content":{"rendered":"<p><strong>Tr\u00e8s d\u00e9licate \u00e0 photographier, HDW 3 est une n\u00e9buleuse plan\u00e9taire de toute beaut\u00e9 situ\u00e9e dans la constellation de Pers\u00e9e.<\/strong><\/p>\n<h5>C\u00e9l\u00e8bre constellation :<\/h5>\n<p>Pour les astronomes, Pers\u00e9e est une constellation bien connue pour ses tr\u00e9sors. On peut y admirer par exemple Algol, une \u00e9toile dont la variabilit\u00e9 est connue depuis l&#8217;Antiquit\u00e9. C&#8217;est aussi dans cette constellation que se trouve un c\u00e9l\u00e8bre double amas d&#8217;\u00e9toiles, <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/10\/16\/a-la-decouverte-du-double-amas-detoiles-de-persee\/\" target=\"_blank\" rel=\"noopener\">NGC 869 et 884<\/a>, visibles \u00e0 l&#8217;\u0153il nu. Mais il est une autre merveille, autrement plus discr\u00e8te : il s&#8217;agit de la n\u00e9buleuse plan\u00e9taire HDW 3. Elle est tellement faible qu&#8217;elle n&#8217;a \u00e9t\u00e9 d\u00e9nich\u00e9e qu&#8217;en 1983. Une d\u00e9couverte \u00e0 mettre au cr\u00e9dit de Herbert <strong>H<\/strong>artl, Johann <strong>D<\/strong>engel et Ronald <strong>W<\/strong>einberger. Pour nous la d\u00e9voiler, Peter Goodhew (<a href=\"https:\/\/www.imagingdeepspace.com\/\" target=\"_blank\" rel=\"noopener\"><em>Imagingdeepspace<\/em><\/a>) n&#8217;a pas h\u00e9sit\u00e9 \u00e0 accumuler 71 heures de poses :<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/02\/hdw3.jpg\" rel=\"lightbox[19044]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-19045\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/02\/hdw3-450x269.jpg\" alt=\"\" width=\"450\" height=\"269\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/02\/hdw3-450x269.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/02\/hdw3-1024x613.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/02\/hdw3-768x460.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/02\/hdw3.jpg 1201w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Avec sa lunette de 152 millim\u00e8tres de diam\u00e8tre, l&#8217;astrophotographe est coutumier des tr\u00e8s longues expositions. Pas moins de 43 heures pour <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/05\/25\/la-nebuleuse-planetaire-abell-31-sestompe-lentement\/\" target=\"_blank\" rel=\"noopener\">Abell 31<\/a> et 37 heures pour <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/11\/23\/pourquoi-voit-on-clignoter-la-nebuleuse-planetaire-ngc-6826\/\" target=\"_blank\" rel=\"noopener\">NGC 6826<\/a> par exemple.\u00a0 <!--more--><\/p>\n<h5>\u00c9trange n\u00e9buleuse plan\u00e9taire :<\/h5>\n<p>La plupart des n\u00e9buleuses plan\u00e9taires (NP) sont rondes. Un aspect &#8220;plan\u00e9taire&#8221; qu&#8217;on avait d\u00e9j\u00e0 remarqu\u00e9 au XVIII\u00e8me si\u00e8cle. Et qui s&#8217;explique facilement : en agonisant, certaines \u00e9toiles expulsent une bulle de gaz en expansion :<\/p>\n<figure id=\"attachment_16100\" aria-describedby=\"caption-attachment-16100\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/06\/spirograph.jpg\" rel=\"lightbox[19044]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-16100\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/06\/spirograph-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/06\/spirograph-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/06\/spirograph-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/06\/spirograph-768x461.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/06\/spirograph.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-16100\" class=\"wp-caption-text\">La plupart des n\u00e9buleuses plan\u00e9taires (ici IC 418, la n\u00e9buleuse du Spirographe) sont circulaires. \u00a9 NASA\/ESA and The Hubble Heritage Team (STScI\/AURA)<\/figcaption><\/figure>\n<p>Pourquoi HDW 3 \u00e9chappe-t-elle \u00e0 cette r\u00e8gle ? Rappelons que le &#8220;vide&#8221; entre les \u00e9toiles est occup\u00e9 par le milieu interstellaire. Cet ISM (pour <a href=\"http:\/\/espg.sr.unh.edu\/ism\/what1.html\" target=\"_blank\" rel=\"noopener\"><em>Interstellar Medium<\/em><\/a>) est principalement compos\u00e9 de gaz (99%) et d&#8217;un peu de poussi\u00e8re. Normalement, la densit\u00e9 de l&#8217;ISM est extr\u00eamement faible et n&#8217;entrave pas l&#8217;expansion de la coquille de gaz des NP. Mais dans le cas de HDW 3, les draperies rouges sur le c\u00f4t\u00e9 gauche de la n\u00e9buleuse trahissent la pr\u00e9sence d&#8217;une r\u00e9gion plus dense. C&#8217;est cette derni\u00e8re qui perturbe le d\u00e9veloppement naturel de la bulle de gaz et donne cet aspect dentel\u00e9 \u00e0 HDW 3.<\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/09\/19\/spectaculaire-plongee-dans-la-nebuleuse-planetaire-ngc-3132\/\" target=\"_blank\" rel=\"noopener\">En vid\u00e9o : plong\u00e9e dans la n\u00e9buleuse plan\u00e9taire NGC 3132<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/02\/10\/lhistoire-de-la-nebuleuse-de-la-belle-au-bois-dormant-alias-egb-9\/\" target=\"_blank\" rel=\"noopener\">EGB 9, la n\u00e9buleuse retrouv\u00e9e par des amateurs<\/a><\/li>\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<\/ul>\n<p>Suivez l\u2019actualit\u00e9 astronomique et d\u00e9couvrez mes images du ciel en vous abonnant \u00e0 Cielmania sur\u00a0<a href=\"https:\/\/www.facebook.com\/cielmania\/\" target=\"_blank\" rel=\"noopener noreferrer\">Facebook<\/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>Tr\u00e8s d\u00e9licate \u00e0 photographier, HDW 3 est une n\u00e9buleuse plan\u00e9taire de toute beaut\u00e9 situ\u00e9e dans la constellation de Pers\u00e9e. C\u00e9l\u00e8bre constellation : Pour les astronomes, Pers\u00e9e est une constellation bien connue pour ses tr\u00e9sors. On peut y admirer par exemple Algol, une \u00e9toile dont la variabilit\u00e9 est connue depuis l&#8217;Antiquit\u00e9. C&#8217;est aussi dans cette constellation &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2024\/05\/08\/une-curieuse-nebuleuse-dentelee-dans-persee\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Une curieuse n\u00e9buleuse dentel\u00e9e dans Pers\u00e9e<\/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":19045,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[171,3534,896,3295],"class_list":["post-19044","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-constellation-de-persee","tag-hdw-3","tag-nebuleuse-planetaire","tag-peter-goodhew"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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