{"id":7540,"date":"2026-03-20T22:25:15","date_gmt":"2026-03-20T20:25:15","guid":{"rendered":"https:\/\/www.schooler.org.ua\/uk-uanajpotuzhnishi-zirki-u-vsesviti-naskilki-bilshimi-voni-mozhut\/"},"modified":"2026-03-20T22:25:15","modified_gmt":"2026-03-20T20:25:15","slug":"uk-uanajpotuzhnishi-zirki-u-vsesviti-naskilki-bilshimi-voni-mozhut","status":"publish","type":"post","link":"https:\/\/www.schooler.org.ua\/cs\/uk-uanajpotuzhnishi-zirki-u-vsesviti-naskilki-bilshimi-voni-mozhut\/","title":{"rendered":"Nejhmotn\u011bj\u0161\u00ed hv\u011bzdy ve vesm\u00edru: jak velk\u00e9 mohou b\u00fdt?"},"content":{"rendered":"

Slunce je \u010dasto naz\u00fdv\u00e1no \u201epr\u016fm\u011brnou\u201c hv\u011bzdou, ale to je zav\u00e1d\u011bj\u00edc\u00ed. Ve skute\u010dnosti je v horn\u00edch 10 % hmotnosti hv\u011bzd. Vesm\u00edru dominuj\u00ed mal\u00ed, slab\u00ed \u010derven\u00ed trpasl\u00edci, z nich\u017e mnoz\u00ed jsou men\u0161\u00ed ne\u017e polovina velikosti Slunce. Hv\u011bzda pot\u0159ebuje m\u00edt alespo\u0148 7-8% slune\u010dn\u00ed hmoty, aby podpo\u0159ila jadernou f\u00fazi, proces, kter\u00fd ji definuje jako hv\u011bzdu. Ale jak hmotn\u00e1 m\u016f\u017ee b\u00fdt hv\u011bzda na druh\u00e9m konci spektra? <\/p>\n

Limity hv\u011bzdn\u00e9 hmotnosti<\/strong> <\/p>\n

Existuje<\/em> horn\u00ed limit. Po ur\u010dit\u00e9m bod\u011b hv\u011bzdy generuj\u00ed tolik energie, \u017ee se destabilizuj\u00ed a rozpadnou. Tento limit nen\u00ed pevn\u00fd; zm\u011bnil se v pr\u016fb\u011bhu kosmologick\u00e9ho \u010dasu. Kl\u00ed\u010dov\u00fdm faktorem nen\u00ed velikost nebo hmotnost, ale hmotnost<\/strong>, kter\u00e1 ur\u010duje rovnov\u00e1hu mezi gravitac\u00ed tahaj\u00edc\u00ed dovnit\u0159 a energi\u00ed tla\u010d\u00edc\u00ed ven. V\u00edce hmoty znamen\u00e1 vy\u0161\u0161\u00ed tlak v j\u00e1d\u0159e, teplotu a nekontrolovatelnou rychlost f\u00faze. <\/p>\n

Rychlost synt\u00e9zy se exponenci\u00e1ln\u011b m\u011bn\u00ed s teplotou. Na Slunci m\u00e1 mal\u00e1 zm\u011bna teploty dramatick\u00fd vliv na produkci energie. Ale u hmotn\u00fdch hv\u011bzd zdvojn\u00e1soben\u00ed teploty zvy\u0161uje produkci energie milionkr\u00e1t<\/em>. Toto extr\u00e9mn\u00ed spojen\u00ed vysv\u011btluje, pro\u010d hv\u011bzdy nemohou jednodu\u0161e r\u016fst donekone\u010dna. <\/p>\n

Zp\u011btn\u00e1 vazba: Masa, energie a zk\u00e1za<\/strong> <\/p>\n

Pokud hv\u011bzda nabere p\u0159\u00edli\u0161 mnoho hmoty, zv\u00fd\u0161\u00ed se jej\u00ed gravitace, zv\u00fd\u0161\u00ed se teplota j\u00e1dra a urychl\u00ed se f\u00faze. T\u00edm se uvoln\u00ed energie, kter\u00e1 odfoukne vn\u011bj\u0161\u00ed vrstvy hv\u011bzdy a sn\u00ed\u017e\u00ed jej\u00ed hmotnost. Tato negativn\u00ed zp\u011btn\u00e1 vazba br\u00e1n\u00ed hv\u011bzd\u00e1m, aby se staly p\u0159\u00edli\u0161 hmotn\u00fdmi. Tyto nestabiln\u00ed hv\u011bzdy proch\u00e1zej\u00ed prudk\u00fdmi erupcemi, kter\u00e9 zp\u016fsobuj\u00ed, \u017ee maj\u00ed kr\u00e1tk\u00e9 \u017eivoty. <\/p>\n

Teoretick\u00e1 horn\u00ed hranice pro hmotnost hv\u011bzd je asi 300 hmotnost\u00ed Slunce. Takov\u00e9 hv\u011bzdy jsou vz\u00e1cn\u00e9; Bylo pozorov\u00e1no pouze n\u011bkolik hmotnost\u00ed p\u0159esahuj\u00edc\u00edch 200 hmotnost\u00ed Slunce. Nejhmotn\u011bj\u0161\u00ed zn\u00e1m\u00e1 hv\u011bzda je R136a1<\/strong>, kter\u00e1 se nach\u00e1z\u00ed ve Velk\u00e9m Magellanov\u011b mra\u010dnu, 160 000 sv\u011bteln\u00fdch let daleko. Vyza\u0159uje sedm milion\u016fkr\u00e1t v\u00edce energie ne\u017e Slunce, co\u017e ospravedl\u0148uje jeho vzd\u00e1lenou polohu. <\/p>\n

R136a1, sou\u010d\u00e1st hv\u011bzdokupy R136, byla zpo\u010d\u00e1tku myln\u011b pova\u017eov\u00e1na za jedinou hv\u011bzdu kv\u016fli sv\u00e9 extr\u00e9mn\u00ed sv\u00edtivosti. Pozorov\u00e1n\u00ed HST potvrdila, \u017ee se jedn\u00e1 o kupu, ale R136a1 z\u016fst\u00e1v\u00e1 netvorem s odhadovanou hmotnost\u00ed 290 hmotnost\u00ed Slunce \u2013 bl\u00edzko teoretick\u00e9mu limitu. Je mlad\u00e1, star\u00e1 pouze milion let a pravd\u011bpodobn\u011b za dal\u0161\u00ed dva miliony let exploduje jako supernova. <\/p>\n

Role t\u011b\u017ek\u00fdch prvk\u016f<\/strong> <\/p>\n

P\u0159\u00edtomnost t\u011b\u017e\u0161\u00edch prvk\u016f ve vn\u011bj\u0161\u00edch vrstv\u00e1ch hv\u011bzdy tak\u00e9 omezuje jej\u00ed hmotnost. Tyto prvky absorbuj\u00ed energii, zvy\u0161uj\u00ed teplotu a urychluj\u00ed ztr\u00e1tu hmoty. I mal\u00e9 mno\u017estv\u00ed t\u011b\u017ek\u00fdch prvk\u016f m\u00e1 v\u00fdznamn\u00fd \u00fa\u010dinek. <\/p>\n

V prvn\u00edch f\u00e1z\u00edch existence Vesm\u00edru tomu v\u0161ak bylo jinak. Prvn\u00ed hv\u011bzdy vznikly v prost\u0159ed\u00ed t\u00e9m\u011b\u0159 bez prvk\u016f t\u011b\u017e\u0161\u00edch ne\u017e vod\u00edk a helium. Bez t\u011bchto prvk\u016f pohlcuj\u00edc\u00edch energii by se prvn\u00ed hv\u011bzdy mohly st\u00e1t mnohem hmotn\u011bj\u0161\u00edmi \u2013 n\u011bkter\u00e9 modely nazna\u010duj\u00ed tis\u00edce hmotnost\u00ed Slunce. Tyto hv\u011bzdy prvn\u00ed generace \u017eily rychle a um\u00edraly mlad\u00e9, zas\u00e9valy vesm\u00edr t\u011b\u017ek\u00fdmi prvky prost\u0159ednictv\u00edm v\u00fdbuch\u016f supernov. <\/p>\n

Vyhled\u00e1v\u00e1n\u00ed hv\u011bzd prvn\u00ed generace<\/strong> <\/p>\n

Navzdory prob\u00edhaj\u00edc\u00edmu p\u00e1tr\u00e1n\u00ed nebyly dosud potvrzeny \u017e\u00e1dn\u00e9 hv\u011bzdy prvn\u00ed generace. Jejich obrovsk\u00e1 sv\u00edtivost v kombinaci s extr\u00e9mn\u00edmi vzd\u00e1lenostmi je \u010din\u00ed matn\u00fdmi a obt\u00ed\u017en\u011b detekovateln\u00fdmi. Jakmile bude jeden objeven, potvrzen\u00ed jednoho donut\u00ed astronomy p\u0159ehodnotit sv\u00e9 odhady, jak by se hmotn\u00e9 hv\u011bzdy ve skute\u010dnosti mohly st\u00e1t \u2013 mo\u017en\u00e1 ne dnes, ale v d\u00e1vn\u00e9 minulosti. <\/p>\n

\n

Pochopen\u00ed limit\u016f hv\u011bzdn\u00e9 hmoty odhaluje z\u00e1kladn\u00ed pravdy o vzniku, v\u00fdvoji a z\u00e1niku hv\u011bzd, kter\u00e9 v\u0161echny z\u00e1vis\u00ed na slo\u017een\u00ed a kosmick\u00e9m na\u010dasov\u00e1n\u00ed.<\/p>\n<\/blockquote>\n","protected":false},"excerpt":{"rendered":"

Slunce je \u010dasto naz\u00fdv\u00e1no \u201epr\u016fm\u011brnou\u201c hv\u011bzdou, ale to je zav\u00e1d\u011bj\u00edc\u00ed. Ve skute\u010dnosti je v horn\u00edch 10 % hmotnosti hv\u011bzd. Vesm\u00edru dominuj\u00ed mal\u00ed, slab\u00ed \u010derven\u00ed trpasl\u00edci, z nich\u017e mnoz\u00ed jsou men\u0161\u00ed ne\u017e polovina velikosti Slunce. Hv\u011bzda pot\u0159ebuje m\u00edt alespo\u0148 7-8% slune\u010dn\u00ed hmoty, aby podpo\u0159ila jadernou f\u00fazi, proces, kter\u00fd ji definuje jako hv\u011bzdu. Ale jak hmotn\u00e1 m\u016f\u017ee […]<\/p>\n","protected":false},"author":1,"featured_media":7539,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"tdm_status":"","tdm_grid_status":""},"categories":[1],"tags":[],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/www.schooler.org.ua\/cs\/wp-json\/wp\/v2\/posts\/7540"}],"collection":[{"href":"https:\/\/www.schooler.org.ua\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.schooler.org.ua\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.schooler.org.ua\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.schooler.org.ua\/cs\/wp-json\/wp\/v2\/comments?post=7540"}],"version-history":[{"count":0,"href":"https:\/\/www.schooler.org.ua\/cs\/wp-json\/wp\/v2\/posts\/7540\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.schooler.org.ua\/cs\/wp-json\/wp\/v2\/media\/7539"}],"wp:attachment":[{"href":"https:\/\/www.schooler.org.ua\/cs\/wp-json\/wp\/v2\/media?parent=7540"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.schooler.org.ua\/cs\/wp-json\/wp\/v2\/categories?post=7540"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.schooler.org.ua\/cs\/wp-json\/wp\/v2\/tags?post=7540"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}