{"id":92634,"date":"2023-02-13T17:45:14","date_gmt":"2023-02-13T16:45:14","guid":{"rendered":"https:\/\/www.astb.se\/cassiopeiabloggen\/?p=92634"},"modified":"2023-02-13T17:49:08","modified_gmt":"2023-02-13T16:49:08","slug":"nr-14-2023","status":"publish","type":"post","link":"https:\/\/www.astb.se\/cassiopeiabloggen\/2023\/02\/13\/nr-14-2023\/","title":{"rendered":"Nr 14 2023"},"content":{"rendered":"\n

O-stj\u00e4rnan som \u00e4r supermagnetisk<\/h2>\n\n\n\n
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Foto: Hans Hilderfors<\/em><\/p>\n\n\n\n

Stort tack till Hans Hilderfors <\/strong>som riktat teleskop, kamera och teknik mot ett annorlunda men desto mera sp\u00e4nninande objekt i Vintergatan, NGC 1624 med Sh2-212\/211. Vi ser inte dessa p\u00e5 bild s\u00e5 ofta. Samtidigt utg\u00f6r O-stj\u00e4rnan, som omtalas nedan, en specialgren f\u00f6r n\u00e5gra f\u00e5 astronomer som intresserar sig f\u00f6r massiva O-stj\u00e4rnor med kraftiga magnetf\u00e4lt 20 000 ggr (20 kk) starkare \u00e4n solens. F\u00e4lten med medf\u00f6ljande magnetosf\u00e4r samverkar med stj\u00e4rnvinden, bromsar upp stj\u00e4rnans axelrotation och st\u00e4ller till diverse konstigheter. Spektrumen med Zeeman-effekt sp\u00f6kar. <\/p>\n\n\n\n

Bilden ovan\u00a0visar NGC 1624, en ung liten \u00f6ppen stj\u00e4rnhop som ligger omg\u00e4rdad av en emissionsnebulosa Sh2-212 i stj\u00e4rnbilden Perseus. Avst\u00e5ndet till oss uppskattas till 20\u00a0000 ljus\u00e5r och \u00e5ldern p\u00e5 stj\u00e4rnhopen \u00e4r mindre \u00e4n 4 miljoner \u00e5r.<\/p>\n\n\n\n

– Den starkaste stj\u00e4rnan som syns i centrum av nebulosan \u00e4r NGC 1624-2, en massiv ung bl\u00e5 stj\u00e4rna av typ O och den mest magnetiserade typ O-stj\u00e4rna som vi k\u00e4nner till. Magnetf\u00e4ltet \u00e4r ungef\u00e4r 20\u00a0000 g\u00e5nger starkare \u00e4n f\u00e4ltet p\u00e5 solen. Se mer t ex h\u00e4r:\u00a0NGC 1624-2 has a complex magnetospheric structure, observations reveal (phys.org)<\/a><\/p>\n\n\n\n

Nedan ser vi \u00e4ven uppe till h\u00f6ger den n\u00e4raliggande emissionsnebulosan Sh2-211 och den kallas ibland tillsammans med Sh2-212 f\u00f6r \u201dTribble Nebulae\u201d eftersom de p\u00e5st\u00e5s likna de lurviga varelserna i Star Trek<\/em>-episoden \u201dThe Trouble with Tribbles\u201d.<\/p>\n\n\n\n

Fakta om bildbevisen:<\/p>\n\n\n\n

* Bilden tagen fr\u00e5n Malm\u00f6 p\u00e5 kv\u00e4llen 8\/2 med min 5\u201d refraktor och monokrom CMOS kamera med filterhjul.<\/p>\n\n\n\n

* Exponering: 20 x 5 min genom vardera H\u03b1 och OIII smalbandsfilter.<\/p>\n\n\n\n

* Bildf\u00e4lt: 35′ x 26′ bild 1 (ovan) och 49′ x 37′ bild 2 (nedan).<\/p>\n\n\n\n

<\/p>\n\n\n\n

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Foto: Hans Hilderfors<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"

O-stj\u00e4rnan som \u00e4r supermagnetisk Foto: Hans Hilderfors Stort tack till Hans Hilderfors som riktat teleskop, kamera och teknik mot ett annorlunda men desto mera sp\u00e4nninande objekt i Vintergatan, NGC 1624 med Sh2-212\/211. Vi ser inte dessa p\u00e5 bild s\u00e5 ofta. Samtidigt utg\u00f6r O-stj\u00e4rnan, som omtalas nedan, en specialgren f\u00f6r n\u00e5gra f\u00e5 astronomer som intresserar sig… L\u00e4s mer »Nr 14 2023<\/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\/92634"}],"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=92634"}],"version-history":[{"count":4,"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/posts\/92634\/revisions"}],"predecessor-version":[{"id":92641,"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/posts\/92634\/revisions\/92641"}],"wp:attachment":[{"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/media?parent=92634"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/categories?post=92634"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/tags?post=92634"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}