{"id":94876,"date":"2024-11-07T20:43:58","date_gmt":"2024-11-07T18:43:58","guid":{"rendered":"https:\/\/www.lovendal.ro\/wp52\/?p=94876"},"modified":"2024-11-07T20:43:58","modified_gmt":"2024-11-07T18:43:58","slug":"un-obiect-ceresc-aflat-la-27-400-de-ani-lumina-se-invarte-atat-de-repede-cu-o-viteza-ce-nu-o-putem-percepe-716-rotatii-pe-secunda","status":"publish","type":"post","link":"https:\/\/www.lovendal.ro\/wp52\/un-obiect-ceresc-aflat-la-27-400-de-ani-lumina-se-invarte-atat-de-repede-cu-o-viteza-ce-nu-o-putem-percepe-716-rotatii-pe-secunda\/","title":{"rendered":"Un obiect ceresc, aflat la 27.400 de ani-lumin\u0103, se \u00eenv\u00e2rte at\u00e2t de repede cu o vitez\u0103 ce nu o putem percepe: 716 rota\u0163ii pe secund\u0103!"},"content":{"rendered":"<figure id=\"attachment_94877\" aria-describedby=\"caption-attachment-94877\" style=\"width: 352px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2024\/11\/stea-neutronica-se-invarte-f-repede.jpeg\"><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-94877\" src=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2024\/11\/stea-neutronica-se-invarte-f-repede.jpeg\" alt=\"\" width=\"362\" height=\"342\" srcset=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2024\/11\/stea-neutronica-se-invarte-f-repede.jpeg 543w, https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2024\/11\/stea-neutronica-se-invarte-f-repede-300x283.jpeg 300w\" sizes=\"auto, (max-width: 362px) 100vw, 362px\" \/><\/a><figcaption id=\"caption-attachment-94877\" class=\"wp-caption-text\"><strong>Imagine<\/strong>: generata de AI (<strong>Microsoft Designer<\/strong>)<\/figcaption><\/figure>\n<p>O <strong>stea neutronic\u0103<\/strong> (numit\u0103 \u015fi <em>&#8222;stea moart\u0103&#8221;<\/em>) &#8211; <strong>4U 1820-30<\/strong> &#8211; aflat\u0103 la 27.400 de ani-lumin\u0103 distan\u021b\u0103, se \u00eenv\u00e2rte at\u00e2t de repede \u00een jurul axei sale centrale \u00eenc\u00e2t efectueaz\u0103 716 rota\u021bii pe secund\u0103. P\u00e2n\u0103 acum nu s-au descoperit stele care se rotesc at\u00e2t de repede, cu excep\u0163ia pulsarului <strong>PSR J1748-2446ad<\/strong>. Aceast\u0103 descoperire a fost f\u0103cut\u0103 de o echip\u0103 condus\u0103 de astrofizicianul <strong>Gaurava Jaisawal<\/strong> de la Universitatea Tehnic\u0103 din Danemarca, confirm\u0103 limita superioar\u0103 teoretic\u0103 actual\u0103 pentru vitezele de rota\u021bie a stelelor de neutroni, care se crede c\u0103 este de aproximativ 730 de rota\u021bii pe secund\u0103. <em>&#8222;Dac\u0103 observa\u021biile viitoare confirm\u0103 acest lucru, steaua cu neutroni 4U 1820-30 ar fi unul dintre obiectele cu cea mai rapid\u0103 rotire observate vreodat\u0103 \u00een Univers&#8221;<\/em>, spune Gaurava Jaisawal.<\/p>\n<p>Stelele neutronice sunt una dintre etapele evolutive finale ale duratei de via\u021b\u0103 a unei stele masive. Odat\u0103 ce o stea \u00eentre aproximativ 8 \u0219i 30 de ori masa Soarelui a r\u0103mas f\u0103r\u0103 atomi, poate fuziona \u00een miezul s\u0103u; ea \u00ee\u015fi ejecteaz\u0103 materialul exterior \u00eentr-o explozie de supernov\u0103, \u00een timp ce miezul, care nu mai este sus\u021binut de presiunea exterioar\u0103 furnizat\u0103 de fuziune, se pr\u0103bu\u0219e\u0219te sub gravita\u021bie. Acest nucleu pr\u0103bu\u0219it este steaua neutronic\u0103, un obiect \u00eentre aproximativ 1,1 \u0219i 2,3 ori masa Soarelui, \u00eempachetat \u00eentr-o sfer\u0103 minuscul\u0103 de doar 20 de kilometri diametru. Materia din interiorul acestor lucruri poate deveni ciudat\u0103, la fel \u0219i comportamentul lor. Avem diferite nume pentru a clasifica acest comportament. Un <strong>magnetar<\/strong> este o stea neutronic\u0103 cu o sfer\u0103 magnetic\u0103 extrem de puternic\u0103. Iar un <strong>pulsar<\/strong> este o stea neutronic\u0103 care se \u00eenv\u00e2rte incredibil de repede, explod\u00e2nd fascicule de unde radio de la poli, astfel \u00eenc\u00e2t acestea par s\u0103 &#8222;pulseze&#8221; \u00een spa\u021biu ca un far cosmic.<\/p>\n<p>\u0218tim c\u0103 4U 1820-30 exist\u0103 cel pu\u021bin din anii 1980. Este un sistem stelar binar din constela\u021bia S\u0103get\u0103torului, care include o stea neutronic\u0103 \u0219i o stea pitic\u0103 alb\u0103, pe o orbit\u0103 foarte str\u00e2ns\u0103, cu o perioad\u0103 de doar 11,4 minute. Apropierea celor dou\u0103 stele \u00eenseamn\u0103 c\u0103 steaua neutronic\u0103 este suficient de aproape pentru a-\u0219i canibaliza companionul, &#8222;dezbr\u0103c\u00e2nd-o&#8221; de material care se acumuleaz\u0103 apoi pe suprafa\u021ba stelei neutronice. Aceast\u0103 acumulare de mas\u0103 devine mai dens\u0103 \u0219i mai fierbinte cu c\u00e2t se acumuleaz\u0103 mai mult, p\u00e2n\u0103 c\u00e2nd \u00een cele din urm\u0103 steaua o expulzeaz\u0103 printr-o explozie termonuclear\u0103. \u00cen timpul acestor explozii, steaua neutronic\u0103 devine de p\u00e2n\u0103 la 100.000 de ori mai str\u0103lucitoare dec\u00e2t Soarele, eliber\u00e2nd o cantitate imens\u0103 de energie.<\/p>\n<p>Steaua de neutroni 4U 1820-30 este un pulsar cu raze X, cu o perioad\u0103 de 716 rota\u021bii pe minut, alimentat de explozii termonucleare.<\/p>\n<p><strong>Sursa<\/strong>: studiul \u015ftiin\u0163ific <a href=\"https:\/\/iopscience.iop.org\/article\/10.3847\/1538-4357\/ad794e\" target=\"_blank\" rel=\"noopener\"><strong>&#8222;A Comprehensive Study of Thermonuclear X-Ray Bursts from 4U 1820\u201330 with NICER: Accretion Disk Interactions and a Candidate Burst Oscillation&#8221; \/ iopscience.iop.org<\/strong><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>O stea neutronic\u0103 (numit\u0103 \u015fi &#8222;stea moart\u0103&#8221;) &#8211; 4U 1820-30 &#8211; aflat\u0103 la 27.400 de ani-lumin\u0103 distan\u021b\u0103, se \u00eenv\u00e2rte at\u00e2t de repede \u00een jurul axei sale centrale \u00eenc\u00e2t efectueaz\u0103 716 rota\u021bii pe secund\u0103. P\u00e2n\u0103 acum nu s-au descoperit stele care &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"Un obiect ceresc, aflat la 27.400 de ani-lumin\u0103, se \u00eenv\u00e2rte at\u00e2t de repede cu o vitez\u0103 ce nu o putem percepe: 716 rota\u0163ii pe secund\u0103!\" class=\"read-more button\" href=\"https:\/\/www.lovendal.ro\/wp52\/un-obiect-ceresc-aflat-la-27-400-de-ani-lumina-se-invarte-atat-de-repede-cu-o-viteza-ce-nu-o-putem-percepe-716-rotatii-pe-secunda\/#more-94876\" aria-label=\"Cite\u0219te mai multe despre Un obiect ceresc, aflat la 27.400 de ani-lumin\u0103, se \u00eenv\u00e2rte at\u00e2t de repede cu o vitez\u0103 ce nu o putem percepe: 716 rota\u0163ii pe secund\u0103!\">Cititi mai multe<\/a><\/p>\n","protected":false},"author":1,"featured_media":94877,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11039],"tags":[102,346,103,3736,66,1230,1367,3442,345,4216,3216,865,733,3443,2988,2317,1087,2250,1840],"class_list":["post-94876","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-astronomie","tag-astronomie","tag-atomi","tag-constelatie","tag-danemarca","tag-energie","tag-explozie","tag-gravitatie","tag-magnetar","tag-materie","tag-orbita","tag-pulsar","tag-soare","tag-stea","tag-stea-neutronica","tag-stea-pitica-alba","tag-supernova","tag-univers","tag-universitate","tag-viteza","resize-featured-image"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.3 (Yoast SEO v24.2) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Un obiect ceresc, aflat la 27.400 de ani-lumin\u0103, se \u00eenv\u00e2rte at\u00e2t de repede cu o vitez\u0103 ce nu o putem percepe: 716 rota\u0163ii pe secund\u0103! - Secretele lui Lovendal<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.lovendal.ro\/wp52\/un-obiect-ceresc-aflat-la-27-400-de-ani-lumina-se-invarte-atat-de-repede-cu-o-viteza-ce-nu-o-putem-percepe-716-rotatii-pe-secunda\/\" \/>\n<meta property=\"og:locale\" content=\"ro_RO\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Un obiect ceresc, aflat la 27.400 de ani-lumin\u0103, se \u00eenv\u00e2rte at\u00e2t de repede cu o vitez\u0103 ce nu o putem percepe: 716 rota\u0163ii pe secund\u0103!\" \/>\n<meta property=\"og:description\" content=\"O stea neutronic\u0103 (numit\u0103 \u015fi &#8222;stea moart\u0103&#8221;) &#8211; 4U 1820-30 &#8211; aflat\u0103 la 27.400 de ani-lumin\u0103 distan\u021b\u0103, se \u00eenv\u00e2rte at\u00e2t de repede \u00een jurul axei sale centrale \u00eenc\u00e2t efectueaz\u0103 716 rota\u021bii pe secund\u0103. 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P\u00e2n\u0103 acum nu s-au descoperit stele care ... 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