{"id":10783,"date":"2011-02-01T23:38:52","date_gmt":"2011-02-01T22:38:52","guid":{"rendered":"http:\/\/www.astb.se\/cassiopeiabloggen\/?p=10783"},"modified":"2011-02-01T23:54:08","modified_gmt":"2011-02-01T22:54:08","slug":"nr-27-2011","status":"publish","type":"post","link":"https:\/\/www.astb.se\/cassiopeiabloggen\/2011\/02\/01\/nr-27-2011\/","title":{"rendered":"Nr 27 2011"},"content":{"rendered":"<h2 style=\"text-align: left;\">\u00c4nnu mer om Epsilon Aurigae<\/h2>\n<p style=\"text-align: left;\">Hur den\u00a0 &#8220;svenska&#8221; ljuskurvan \u00f6ver Epsilon Aurigae ser ut (se f\u00f6rra bloggen) kan vi nu ser h\u00e4r, tack vare Hans Bengtssons flit:<\/p>\n<figure id=\"attachment_10784\" aria-describedby=\"caption-attachment-10784\" style=\"width: 434px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2011\/02\/ExternalURLProxy-1.jpg\"><img decoding=\"async\" class=\"size-full wp-image-10784\" src=\"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2011\/02\/ExternalURLProxy-1.jpg\" alt=\"\" width=\"434\" height=\"192\" srcset=\"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2011\/02\/ExternalURLProxy-1.jpg 1612w, https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2011\/02\/ExternalURLProxy-1-300x133.jpg 300w, https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2011\/02\/ExternalURLProxy-1-1024x454.jpg 1024w\" sizes=\"(max-width: 434px) 100vw, 434px\" \/><\/a><figcaption id=\"caption-attachment-10784\" class=\"wp-caption-text\">Klicka\/dubbelklicka p\u00e5 bilden s\u00e5 f\u00e5r du upp den i storformat p\u00e5 din sk\u00e4rm.<\/figcaption><\/figure>\n<p style=\"text-align: left;\">ASTB-legendaren, v\u00e5r tidigare ordf\u00f6rande Gunnar Larsson-Leander gjorde en serie betydande observationer p\u00e5 50-talet av systemet som numera finns p\u00e5 n\u00e4tet, <a href=\"http:\/\/adsabs.harvard.edu\/full\/1959ArA.....2..283L\" target=\"_self\">dels en rapport h\u00e4r <\/a>(&#8220;Photoelectric observations of the 1955-1957 eclipse of Epsilon Aurigae&#8221;) i Harvard\/NASA:s f\u00f6rn\u00e4mliga dataarkiv, <a href=\"http:\/\/adsabs.harvard.edu\/full\/1962ArA.....3...17L\" target=\"_self\">dels denna <\/a>(&#8220;Photoelectric observations of Epsilon Aurigae out of eclipse&#8221;)<\/p>\n<p style=\"text-align: left;\">Hans f\u00f6rklarar aprop\u00e5 sin sammanst\u00e4llning ovan:<\/p>\n<div><strong>&#8220;L\u00e4ngs x-axeln i diagrammet<\/strong> har vi fasen, d\u00e4r noll \u00e4r f\u00f6rm\u00f6rkelsens mitt enligt generalkatalogens element:<\/div>\n<div>minimum = JD 2 445 513 + 9884 * E<\/div>\n<div>Eftersom perioden \u00e4r 9884 dygn s\u00e5 motsvarar en fasskillnad 0.01 i detta fall 98.84 dygn.<\/div>\n<div>L\u00e4ngs y-axeln hittar vi V-magnituden.<\/div>\n<div>Snart kan vi f\u00f6rv\u00e4nta oss att Epsilon raskt b\u00f6rja \u00f6ka i ljusstyrka.  Den cykliska f\u00f6r\u00e4ndring vi ser, med amplitud omkring en tiondels  magnitud och period kring tv\u00e5 m\u00e5nader, beror p\u00e5 pulsationer i systemets  huvudstj\u00e4rna och \u00e4r frikopplad fr\u00e5n f\u00f6rm\u00f6rkelsefenomenet. F\u00f6rmodligen \u00e4r  den del av ljuskurvan som beror p\u00e5 f\u00f6rm\u00f6rkelsen platt som ett dansgolv &#8211;  men det \u00e4r f\u00f6rst\u00e5s en knivig uppgift att s\u00e4rskilja de tv\u00e5 separata  variationerna fr\u00e5n varandra.&#8221;<\/div>\n<div>Kortfakta om Epsilon Aurigae, excerperat\u00a0 ur <em>Astronomisk uppslagsbok<\/em> av Per Ahlin, Bj\u00f6rn Stenholm och Anita Sundman):<br \/>\n* Stj\u00e4rnan \u00e4r en f\u00f6rm\u00f6rkelsevariabel med den l\u00e4ngst k\u00e4nda perioden, 27 \u00e5r.<\/div>\n<div>* Prim\u00e4rstj\u00e4rnan \u00e4r en superj\u00e4tte av spektralklassen F0.<\/div>\n<div>* Sekund\u00e4rstj\u00e4rnan f\u00f6rmodas omges av en stoftskiva, som orsakar f\u00f6rm\u00f6rkelsen.<\/div>\n<div>* Avst\u00e5ndet till stj\u00e4rnan i Kusken \u00e4r ca 2000 ljus\u00e5r.<\/div>\n<div>Senaste uppgifter p\u00e5 n\u00e4tet ber\u00e4ttar dessutom att <strong>&#8220;primarien&#8221; i \u03b5 Aur har en massa 2,2-3,3 ggr solens<\/strong> och att den f\u00f6rm\u00f6rkas av en B-stj\u00e4rna inuti den misst\u00e4nkta stoftskivan.<\/div>\n<div><strong>Avst\u00e5ndet mellan F0-stj\u00e4rnan och stoftskivan<\/strong> uppges till cirka 30 AU, ungef\u00e4r avst\u00e5ndet solen-Neptunus.<\/div>\n<div>Rymdkonstn\u00e4rerna hos NASA\/JPL-Caltech t\u00e4nker sig systemet se ut s\u00e5 h\u00e4r:<a href=\"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2011\/02\/Epsilon_Aurigae.jpg\"><img decoding=\"async\" class=\"size-full wp-image-10786 aligncenter\" src=\"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2011\/02\/Epsilon_Aurigae.jpg\" alt=\"\" width=\"410\" height=\"224\" srcset=\"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2011\/02\/Epsilon_Aurigae.jpg 640w, https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2011\/02\/Epsilon_Aurigae-300x164.jpg 300w\" sizes=\"(max-width: 410px) 100vw, 410px\" \/><\/a><\/div>\n<h2>\u00c4nnu en f\u00f6rn\u00e4mlig science-blogg (fr\u00e5n Malm\u00f6&#8230;.)<\/h2>\n<div>\n<p>Kjell Werner tipsar om att Malm\u00f6pedagogen Paul Belfrage har b\u00f6rjat med en ny blogg, som varmt rekommenderas:<\/p>\n<p><a href=\"https:\/\/webmail.telia.com\/cp\/ps\/Mail\/ExternalURLProxy?d=pne.telia.com&amp;u=u48702769&amp;url=http:\/\/visualizescience.blogspot.com&amp;urlHash=6.052815280983366E-65\" target=\"_BLANK\">http:\/\/visualizescience.blogspot.com<\/a><\/p>\n<\/div>\n<div>\n<p>M\u00e5let beskriver Paul s\u00e5 h\u00e4r:<\/p>\n<\/div>\n<div>\n<p><em>&#8220;This  is a blog about the power and beauty of visualizing  science. I will gather the  best websites, software and videos I can  find. &#8220;<\/em><\/p>\n<p>Den som surfar in om blir glatt \u00f6verraskad \u00f6ver en massa god info och tips i \u00e4mnena fysik, matte, astronomi, kemi, biologi&#8230; jag har en alldeles best\u00e4md k\u00e4nsla av att Paul \u00e4r en av de v\u00e5ra!!!!<em> <\/em><\/p>\n<h2>Arnes favorit-serie just nu<\/h2>\n<p><a href=\"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2011\/02\/kunskapskanalen.jpg\"><img decoding=\"async\" class=\"alignleft size-full wp-image-10792\" src=\"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2011\/02\/kunskapskanalen.jpg\" alt=\"\" width=\"91\" height=\"97\" \/><\/a>Arne Str\u00f6mgren, sk\u00e5disen och regiss\u00f6ren, \u00e4r en entusiastisk astronomiv\u00e4n och l\u00e4ser allt i \u00e4mnet han kommer \u00f6ver och ser med gl\u00e4dje p\u00e5 popul\u00e4rvetenskapliga tv-program. Som <em>Jakten p\u00e5 universums slut<\/em>, som Kunskapskanalen, SVT:s enda vettiga kanal, har s\u00e4nt och s\u00e4nder repriser p\u00e5 just nu:<\/p>\n<p>&#8211; \u00c4ven i fall speakern uttalar Galileis namn &#8220;Galilej&#8221; \u00e4r det en fantastisk serie Rekommenderas!<\/p>\n<h2>\n<div>\n<p>Urens V\u00e4nner m\u00f6ts i Malm\u00f6<\/p>\n<\/div>\n<\/h2>\n<p>Visste du om att i Malm\u00f6 finns en lokalavdelning av <span style=\"text-decoration: underline;\">De Gamla Urens V\u00e4nner<\/span>?<\/p>\n<p>Tiden m\u00e5 vara ur led, men n\u00e4r detta celebra s\u00e4llskap ses h\u00e4rn\u00e4st 16 februari s\u00e4ger ryktet att Per Ragnarson, Tekniska museets tidigare chef, ska prata om det konstur han v\u00e4ckt till liv och som vi skrivit om tidigare h\u00e4r i W-bloggen:<\/p>\n<p>Trelleborgaren Bernt Kjerstr\u00f6ms konstur fr\u00e5n 1700-talet.<\/p>\n<p>Per Ragnarson har p\u00e5 m\u00e4rkliga v\u00e4gar kommit uret p\u00e5 sp\u00e5ren.<\/p>\n<\/div>\n<p style=\"text-align: left;\">\n","protected":false},"excerpt":{"rendered":"<p>\u00c4nnu mer om Epsilon Aurigae Hur den\u00a0 &#8220;svenska&#8221; ljuskurvan \u00f6ver Epsilon Aurigae ser ut (se f\u00f6rra bloggen) kan vi nu ser h\u00e4r, tack vare Hans Bengtssons flit: ASTB-legendaren, v\u00e5r tidigare ordf\u00f6rande Gunnar Larsson-Leander gjorde en serie betydande observationer p\u00e5 50-talet av systemet som numera finns p\u00e5 n\u00e4tet, dels en rapport h\u00e4r (&#8220;Photoelectric observations of the&hellip;&nbsp;<a href=\"https:\/\/www.astb.se\/cassiopeiabloggen\/2011\/02\/01\/nr-27-2011\/\" rel=\"bookmark\">L\u00e4s mer &raquo;<span class=\"screen-reader-text\">Nr 27 2011<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"rop_custom_images_group":[],"rop_custom_messages_group":[],"rop_publish_now":"initial","rop_publish_now_accounts":[],"rop_publish_now_history":[],"rop_publish_now_status":"pending","neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","footnotes":""},"categories":[3],"tags":[],"_links":{"self":[{"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/posts\/10783"}],"collection":[{"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/comments?post=10783"}],"version-history":[{"count":11,"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/posts\/10783\/revisions"}],"predecessor-version":[{"id":10796,"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/posts\/10783\/revisions\/10796"}],"wp:attachment":[{"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/media?parent=10783"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/categories?post=10783"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/tags?post=10783"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}