{"id":99073,"date":"2025-07-25T12:19:28","date_gmt":"2025-07-25T09:19:28","guid":{"rendered":"https:\/\/www.lovendal.ro\/wp52\/?p=99073"},"modified":"2025-07-25T12:19:28","modified_gmt":"2025-07-25T09:19:28","slug":"descoperire-extraordinara-nasa-giganta-si-celebra-stea-portocalie-betelgeuse-are-un-companion","status":"publish","type":"post","link":"https:\/\/www.lovendal.ro\/wp52\/descoperire-extraordinara-nasa-giganta-si-celebra-stea-portocalie-betelgeuse-are-un-companion\/","title":{"rendered":"Descoperire extraordinar\u0103 NASA: giganta \u015fi celebra stea portocalie Betelgeuse are un companion"},"content":{"rendered":"<p><a href=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2025\/07\/Betelgeuse-stea-binara.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-99074\" src=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2025\/07\/Betelgeuse-stea-binara.jpg\" alt=\"\" width=\"370\" height=\"256\" srcset=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2025\/07\/Betelgeuse-stea-binara.jpg 370w, https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2025\/07\/Betelgeuse-stea-binara-300x208.jpg 300w\" sizes=\"auto, (max-width: 370px) 100vw, 370px\" \/><\/a>Timp de peste o sut\u0103 de ani, astronomii au suspectat c\u0103 <strong>Betelgeuse<\/strong>, una dintre cele mai u\u0219or de recunoscut stele de pe cerul nop\u021bii, ar putea s\u0103 nu fie un obiect solitar. Betelgeuse se num\u0103r\u0103 printre cele mai str\u0103lucitoare stele vizibile de pe P\u0103m\u00e2nt, se afl\u0103 la aproximativ 640 de ani-lumin\u0103 fa\u0163\u0103 de noi \u0219i a fost monitorizat\u0103 \u00eendeaproape pentru fluctua\u021biile sale neobi\u0219nuite de luminozitate \u0219i mi\u0219care. Eforturile repetate de a explica aceste varia\u021bii prin pulsa\u021bii stelare au fost neconcludente. Acum \u00eens\u0103, o nou\u0103 descoperire realizat\u0103 de o echip\u0103 de la Centrul de Cercetare Ames al NASA confirm\u0103 ceea ce genera\u021bii de astronomi au emis ipoteza: Betelgeuse face parte dintr-un sistem binar.<\/p>\n<p>Anun\u021bul, sus\u021binut de un studiu publicat \u00een <strong><em>&#8222;The Astrophysical Journal Letters&#8221;<\/em><\/strong> \u0219i de un comunicat de pres\u0103 oficial al NASA, descrie probabila imagistic\u0103 direct\u0103 a stelei companion a lui Betelgeuse. Detectarea a fost f\u0103cut\u0103 folosind telescopul <em>Gemini North<\/em> de 8,1 metri situat \u00een Hawaii, echipat cu un instrument de imagistic\u0103 de \u00eenalt\u0103 rezolu\u021bie dezvoltat de NASA. Cunoscut sub numele de <em>&#8222;Alopeke&#8221;<\/em>, acest sistem a surprins un obiect secundar slab vizibil \u00een apropierea lui Betelgeuse, care corespunde orbitei, luminozit\u0103\u021bii \u0219i separ\u0103rii unghiulare prezise descrise \u00een lucr\u0103ri teoretice anterioare. Acest obiect a primit acum numele de <strong>Siwarha<\/strong>, un termen arab care \u00eenseamn\u0103 <em>&#8222;br\u0103\u021bara ei&#8221;<\/em>, cu referire la numele tradi\u021bional al lui Betelgeuse ca <em>&#8222;m\u00e2na lui al-Jawza&#8221;<\/em> din vechile tradi\u021bii arabe despre stele. Numele reflect\u0103 orbita obiectului \u00een jurul lui Betelgeuse \u0219i men\u021bine continuitatea cu mo\u0219tenirea cultural\u0103 asociat\u0103 stelei.<\/p>\n<p>Timp de decenii, Betelgeuse i-a nedumerit pe cercet\u0103tori cu un model recurent de varia\u021bie a luminozit\u0103\u021bii care dureaz\u0103 aproximativ 6 ani. Aceste cicluri au fost observate al\u0103turi de modific\u0103ri ale vitezei radiale a stelei \u0219i de u\u0219oare schimb\u0103ri ale pozi\u021biei acesteia, toate acestea neput\u00e2nd fi explicate \u00een mod adecvat prin procese stelare interne. Studiile anterioare propuseser\u0103 prezen\u021ba unui companion invizibil care influen\u021beaz\u0103 Betelgeuse prin interac\u021biuni gravita\u021bionale. Observa\u021biile efectuate cu telescoape spa\u021biale, inclusiv cele operate de <em>Hubble<\/em> \u0219i <em>Chandra<\/em>, nu au reu\u0219it s\u0103 rezolve obiectul secundar, \u00een mare parte din cauza str\u0103lucirii intense produse de straturile exterioare masive ale lui Betelgeuse.<\/p>\n<p>Acest ultim efort a dep\u0103\u0219it aceast\u0103 barier\u0103 folosind o abordare bazat\u0103 pe capturarea a mii de imagini rapide, cu expunere scurt\u0103, pentru a minimiza distorsiunea atmosferic\u0103. Instrumentul &#8222;Alopeke&#8221; a \u00eemp\u0103r\u021bit lumina \u00een dou\u0103 canale \u0219i, prin combinarea datelor rezultate, echipa a reu\u0219it s\u0103 construiasc\u0103 o imagine cu contrast ridicat care a dezv\u0103luit un obiect slab, separat cu doar 52 de miliarcasecunde de steaua primar\u0103. Aceast\u0103 pozi\u021bie corespunde exact cu predic\u021biile f\u0103cute \u00een 2024 de echipe care au studiat peste un secol de \u00eenregistr\u0103ri observa\u021bionale.<\/p>\n<p>Contrastul de luminozitate dintre cele dou\u0103 stele este extrem. Betelgeuse, o supergigant\u0103 ro\u0219ie cu o mas\u0103 de aproximativ 20 de ori mai mare dec\u00e2t cea a Soarelui, a fost \u00eenregistrat\u0103 la o magnitudine \u00een banda B de 2,5 \u00een timpul observa\u021biei. S-a m\u0103surat c\u0103 steaua \u00eenso\u021bitoare este cu aproximativ \u0219ase magnitudini mai slab\u0103, ceea ce corespunde unei magnitudini \u00een banda B de 8,5. La distan\u021ba cunoscut\u0103 de 168 de parseci, aceasta implic\u0103 faptul c\u0103 Siwarha are o magnitudine absolut\u0103 de aproximativ 2,4 \u0219i o clasificare probabil\u0103 ca o stea pitic\u0103 t\u00e2n\u0103r\u0103 de tip F, cu o mas\u0103 de aproximativ 1,6 ori mai mare dec\u00e2t cea a Soarelui.<\/p>\n<p>Modelele generate de cercet\u0103torii anteriori preziseser\u0103 o mas\u0103 a stelei \u00eenso\u021bitoare \u00eentre 0,6 \u0219i 2 mase solare, orbit\u00e2nd Betelgeuse la fiecare \u0219ase ani pe o traiectorie aproape lateral\u0103. Aceste predic\u021bii s-au bazat pe o analiz\u0103 atent\u0103 a variabilit\u0103\u021bii pe termen lung, at\u00e2t a luminii, c\u00e2t \u0219i a mi\u0219c\u0103rii. Separarea unghiular\u0103 detectat\u0103 \u00een 2024, combinat\u0103 cu astrometria istoric\u0103, sus\u021bine o distan\u021b\u0103 fizic\u0103 maxim\u0103 \u00eentre cele dou\u0103 stele de aproximativ 0,06 secunde de arc la cea mai mic\u0103 apropiere.<\/p>\n<p>Dac\u0103 Siwarha s-a format al\u0103turi de Betelgeuse, probabil face parte din acela\u0219i sistem stelar timpuriu, care are acum o vechime de aproximativ 10 milioane de ani. Folosind modele evolutive stelare, cercet\u0103torii au cartografiat masa posibil\u0103 \u0219i temperatura efectiv\u0103 a stelei companion. Presupun\u00e2nd c\u0103 nu exist\u0103 obscuritate de praf \u0219i o linie vizual\u0103 direct\u0103, temperatura efectiv\u0103 a stelei companion se situeaz\u0103 \u00eentre 6.000 \u0219i 10.000 de kelvini, \u00een func\u021bie de luminozitatea sa real\u0103.<\/p>\n<p>Descoperirea ofer\u0103, de asemenea, un nou context pentru evenimentul &#8222;marii \u00eentunec\u0103ri&#8221; din 2019-2020, c\u00e2nd Betelgeuse a pierdut peste o magnitudine de luminozitate vizual\u0103 \u00een c\u00e2teva s\u0103pt\u0103m\u00e2ni. Unii au speculat c\u0103 acesta a fost un semn al unei supernove iminente, dar observa\u021biile ulterioare au stabilit c\u0103 evenimentul a fost cauzat de o scurgere masiv\u0103 de material de la suprafa\u021b\u0103 care s-a condensat \u00een praf. \u00cen aceast\u0103 perioad\u0103, dimensiunea lui Betelgeuse a r\u0103mas aproape constant\u0103, a\u0219a cum este confirmat de m\u0103sur\u0103torile diametrului unghiular efectuate \u00een timpul aceleia\u0219i campanii de observare. Vede\u0163i mai multe \u00een acest articol: <a href=\"https:\/\/www.lovendal.ro\/wp52\/misterul-intunecarii-stelei-gigantice-betelgeuse-ce-s-a-intamplat-cu-acest-astru-portocaliu-aflat-la-doar-700-de-ani-lumina-fata-de-noi\/\" target=\"_blank\" rel=\"noopener\"><strong>Misterul \u00eentunec\u0103rii stelei gigantice Betelgeuse.<\/strong><\/a><a href=\"https:\/\/www.lovendal.ro\/wp52\/misterul-intunecarii-stelei-gigantice-betelgeuse-ce-s-a-intamplat-cu-acest-astru-portocaliu-aflat-la-doar-700-de-ani-lumina-fata-de-noi\/\" target=\"_blank\" rel=\"noopener\"><strong> Ce s-a \u00eent\u00e2mplat cu acest astru portocaliu, aflat la doar 700 de ani-lumin\u0103 fa\u0163\u0103 de noi?<\/strong><\/a><\/p>\n<p>Odat\u0103 cu aceast\u0103 descoperire, o ipotez\u0103 astronomic\u0103 de lung\u0103 durat\u0103 a fost adus\u0103 \u00een aten\u021bia observa\u021biilor. Sistemul Betelgeuse nu mai este o singur\u0103 stea, ci o pereche binar\u0103, cu toat\u0103 complexitatea pe care o implic\u0103 o astfel de configura\u021bie. Detectarea Siwarha nu doar \u00eenchide un capitol de incertitudine, ci deschide unul nou \u00een \u00een\u021belegerea modului \u00een care stelele masive evolueaz\u0103, interac\u021bioneaz\u0103 \u0219i mor.<\/p>\n<p><strong>Sursa:<\/strong> studiul \u015ftiin\u0163ific <a href=\"https:\/\/iopscience.iop.org\/article\/10.3847\/2041-8213\/adeaaf\" target=\"_blank\" rel=\"noopener\"><strong>&#8222;The Probable Direct-imaging Detection of the Stellar Companion to Betelgeuse&#8221; \/ iopscience.iop.org<\/strong><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Timp de peste o sut\u0103 de ani, astronomii au suspectat c\u0103 Betelgeuse, una dintre cele mai u\u0219or de recunoscut stele de pe cerul nop\u021bii, ar putea s\u0103 nu fie un obiect solitar. Betelgeuse se num\u0103r\u0103 printre cele mai str\u0103lucitoare stele &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"Descoperire extraordinar\u0103 NASA: giganta \u015fi celebra stea portocalie Betelgeuse are un companion\" class=\"read-more button\" href=\"https:\/\/www.lovendal.ro\/wp52\/descoperire-extraordinara-nasa-giganta-si-celebra-stea-portocalie-betelgeuse-are-un-companion\/#more-99073\" aria-label=\"Cite\u0219te mai multe despre Descoperire extraordinar\u0103 NASA: giganta \u015fi celebra stea portocalie Betelgeuse are un companion\">Cititi mai multe<\/a><\/p>\n","protected":false},"author":1,"featured_media":99074,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11039],"tags":[7396,102,1630,3565,352,435,20083,150,4216,105,6987,20084,865,733,2809,2317,434,2358],"class_list":["post-99073","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-astronomie","tag-astronomi","tag-astronomie","tag-betelgeuse","tag-chandra","tag-hawaii","tag-hubble","tag-luminozitate","tag-nasa","tag-orbita","tag-pamant","tag-praf","tag-siwarha","tag-soare","tag-stea","tag-stea-companion","tag-supernova","tag-telescop","tag-temperatura","resize-featured-image"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.3 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Descoperire extraordinar\u0103 NASA: giganta \u015fi celebra stea portocalie Betelgeuse are un companion - 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\/descoperire-extraordinara-nasa-giganta-si-celebra-stea-portocalie-betelgeuse-are-un-companion\/\" \/>\n<meta property=\"og:locale\" content=\"ro_RO\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Descoperire extraordinar\u0103 NASA: giganta \u015fi celebra stea portocalie Betelgeuse are un companion\" \/>\n<meta property=\"og:description\" content=\"Timp de peste o sut\u0103 de ani, astronomii au suspectat c\u0103 Betelgeuse, una dintre cele mai u\u0219or de recunoscut stele de pe cerul nop\u021bii, ar putea s\u0103 nu fie un obiect solitar. 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Betelgeuse se num\u0103r\u0103 printre cele mai str\u0103lucitoare stele ... 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