{"id":971,"date":"2005-09-09T08:18:00","date_gmt":"2005-09-09T06:18:00","guid":{"rendered":"https:\/\/kids.esa.int\/cannibal_star_eats_companion\/"},"modified":"2026-10-08T00:34:22","modified_gmt":"2026-10-07T22:34:22","slug":"cannibal_star_eats_companion","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/da\/cannibal_star_eats_companion\/","title":{"rendered":"Cannibal-stjerne spiser sin ledsager"},"content":{"rendered":"
\n

ESA\u2019s rumobservatorium Integral har for f\u00f8rste gang opdaget en hurtigt roterende stjerne, der er ved at opsluge sin mindre nabo.<\/p>\n<\/div>\n

Den roterende stjerne er ingen almindelig stjerne. Den havde oprindeligt en masse, der var mindst otte gange st\u00f8rre end Solens, men er nu kollapset til en supert\u00e6t neutronstjerne med en diameter p\u00e5 kun 20 km. En teskefuld af dens materiale ville veje omkring en milliard ton.<\/p>\n

Selvom den er alt for lille til at kunne ses med et almindeligt teleskop, kan neutronstjernen ses i r\u00f8ntgenlys. Den blev opdaget af Integral under en rutinem\u00e6ssig afs\u00f8gning af himlen den 2. december 2004, da den pludselig udsendte et kraftigt r\u00f8ntgenudbrud.<\/p>\n

\"Animation
Animation af en pulsar, der 'spiser' stof fra sin ledsagestjerne<\/figcaption><\/figure>\n

M\u00e5linger foretaget af Integral og NASAs rumsonde \u2018Rossi X-ray Timing Explorer\u2019 viser, at den \u00bbkannibalske\u00ab stjerne er en \u00bbpulsar\u00ab \u2013 en hurtigt roterende neutronstjerne. Faktisk er den en af de hurtigst roterende pulsarer, der nogensinde er fundet. I \u00f8jeblikket roterer den med en svimlende hastighed \u2013 omkring 600 omdrejninger i sekundet \u2013 og bliver gradvist endnu hurtigere.<\/p>\n

Opvarmningsprocessen finder sted, n\u00e5r gas, der rives ud af ledsagestjernen, rammer overfladen. Dette voldsomme tilf\u00f8rselsr\u00e6s opvarmer den til en temperatur p\u00e5 n\u00e6sten en milliard grader, hvorved der frigives enorme m\u00e6ngder r\u00f8ntgenstr\u00e5ler og gammastr\u00e5ler.<\/p>\n

I mellemtiden er ledsagestjernen allerede skrumpet ind til en br\u00f8kdel af Solens st\u00f8rrelse, m\u00e5ske s\u00e5 lille som 40 gange Jupiters masse. De to stjerner ligger s\u00e5 t\u00e6t p\u00e5 hinanden, at de begge ville kunne rummes inden for Solens radius. For at overleve suser den skrumpende nabostjerne rundt om sin neutronstjerne-nabo p\u00e5 blot 2,5 timer.<\/p>","protected":false},"excerpt":{"rendered":"

ESA\u2019s Integral space observatory has made its first discovery of a fast-spinning star that is swallowing its smaller neighbour. The star in a spin is no ordinary star. Originally at […]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"esa_banner_image":"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2005\/08\/artist_s_impression_of_a_pulsar_eating_a_companion_star2\/17883880-2-eng-GB\/Artist_s_impression_of_a_pulsar_eating_a_companion_star.jpg","esa_banner_description":"Artist's impression of a pulsar 'eating' a companion star","esa_banner_credit":"NASA\/Dana Berry","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2005\/08\/Artist_s_impression_of_a_pulsar_eating_a_companion_star2","esa_external_url":"","esa_external_new_window":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":true},"categories":[26],"tags":[],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-971","post","type-post","status-publish","format-standard","hentry","category-news"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/971","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/comments?post=971"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/971\/revisions"}],"predecessor-version":[{"id":4764,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/posts\/971\/revisions\/4764"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/media?parent=971"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/categories?post=971"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/tags?post=971"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/panel?post=971"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/language?post=971"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/age?post=971"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/duration?post=971"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/resource_type?post=971"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/audience?post=971"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/da\/wp-json\/wp\/v2\/wf_post_folders?post=971"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}