{"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\/nb\/cannibal_star_eats_companion\/","title":{"rendered":"Kannibalstjerne spiser sin f\u00f8lgesvenn"},"content":{"rendered":"
\n

ESAs romobservatorium Integral har for f\u00f8rste gang oppdaget en hurtigroterende stjerne som sluker sin mindre nabo.<\/p>\n<\/div>\n

Den roterende stjernen er ingen vanlig stjerne. Den hadde opprinnelig minst \u00e5tte ganger st\u00f8rre masse enn Solen, men har n\u00e5 kollapset til en ekstremt tett n\u00f8ytronstjerne med en diameter p\u00e5 bare 20 km. En teskje av materialet fra den ville veie omtrent en milliard tonn.<\/p>\n

Selv om den er altfor liten til \u00e5 kunne ses med et vanlig teleskop, kan n\u00f8ytronstjernen observeres i r\u00f8ntgenlys. Den ble oppdaget av Integral under en rutinemessig kartlegging av himmelen den 2. desember 2004, da den plutselig avga et kraftig r\u00f8ntgenutbrudd.<\/p>\n

\"Animation
Animasjon av en pulsar som 'spiser' materie fra en ledsagerstjerne<\/figcaption><\/figure>\n

M\u00e5linger utf\u00f8rt av Integral og NASAs romfart\u00f8y \u2018Rossi X-ray Timing Explorer\u2019 viser at den \u00abkannibalske\u00bb stjernen er en \u00abpulsar\u00bb \u2013 en raskt roterende n\u00f8ytronstjerne. Den er faktisk en av de raskest roterende pulsarene som noensinne er oppdaget. For \u00f8yeblikket roterer den med en svimlende hastighet \u2013 rundt 600 ganger i sekundet \u2013 og blir gradvis enda raskere.<\/p>\n

Oppvarmingsprosessen skjer n\u00e5r gass som rives l\u00f8s fra f\u00f8lgesatellitten sl\u00e5r ned p\u00e5 overflaten. Denne voldsomme tilf\u00f8rselen varmer den opp til en temperatur p\u00e5 nesten en milliard grader, og frigj\u00f8r enorme mengder r\u00f8ntgenstr\u00e5ling og gammastr\u00e5ling.<\/p>\n

I mellomtiden har f\u00f8lgesvennen allerede krympet til en br\u00f8kdel av Solens st\u00f8rrelse, kanskje s\u00e5 liten som 40 Jupiter-masser. De to stjernene ligger s\u00e5 tett at de ville f\u00e5 plass innenfor Solens radius. For \u00e5 overleve m\u00e5 den krympende naboen suse rundt sin nabo, en n\u00f8ytronstjerne, p\u00e5 bare 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\/nb\/wp-json\/wp\/v2\/posts\/971","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/comments?post=971"}],"version-history":[{"count":4,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/posts\/971\/revisions"}],"predecessor-version":[{"id":4764,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/posts\/971\/revisions\/4764"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/media?parent=971"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/categories?post=971"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/tags?post=971"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/panel?post=971"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/language?post=971"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/age?post=971"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/duration?post=971"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/resource_type?post=971"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/audience?post=971"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/nb\/wp-json\/wp\/v2\/wf_post_folders?post=971"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}