Dvojhv\u011bzda BD+20 5391 se uk\u00e1zala b\u00fdt mimo\u0159\u00e1dn\u011b vz\u00e1cn\u00fdm p\u0159\u00edpadem dvou \u010derven\u00fdch obr\u016f t\u00e9m\u011b\u0159 toto\u017en\u00e9 hmotnosti, kter\u00e9 se vyv\u00edjej\u00ed bok po boku. Nov\u00e1 studie veden\u00e1 t\u00fdmem z univerzity v Potsdami, na n\u00ed\u017e spolupracovali i odborn\u00edci ze Stel\u00e1rn\u00edho odd\u011blen\u00ed ASU, p\u0159in\u00e1\u0161\u00ed detailn\u00ed pohled na jejich fyzik\u00e1ln\u00ed vlastnosti, ob\u011b\u017enou dr\u00e1hu a budouc\u00ed v\u00fdvoj. V\u00fdsledky nazna\u010duj\u00ed, \u017ee z obou obr\u016f brzy za\u010dne p\u0159et\u00e9kat hmota do okol\u00ed, co\u017e m\u016f\u017ee v\u00e9st bu\u010f k jejich splynut\u00ed, nebo ke vzniku mimo\u0159\u00e1dn\u011b t\u011bsn\u00e9 dvojice b\u00edl\u00fdch trpasl\u00edk\u016f. Ka\u017edop\u00e1dn\u011b p\u016fjde o jedine\u010dn\u00fd laboratorn\u00ed p\u0159\u00edpad v\u00fdvoje dvojhv\u011bzd v pokro\u010dil\u00fdch f\u00e1z\u00edch \u017eivota.<\/p>\n\n\n\n
…<\/p>\n\n\n\n
P\u0159\u00edm\u00e9 pozorov\u00e1n\u00ed takov\u00e9ho syst\u00e9mu je mimo\u0159\u00e1dn\u011b obt\u00ed\u017en\u00e9. Pr\u00e1v\u011b proto p\u0159it\u00e1hl pozornost syst\u00e9m BD+20 5391, objeven\u00fd p\u0159i v\u00fdzkumu \u010derven\u00fdch obr\u016f dvoumetrov\u00fdm Perkov\u00fdm dalekohledem ASU. Studie p\u0159ijat\u00e1 k publikaci v \u010dasopise Astronomy & Astrophysics p\u0159edstavuje podrobn\u00fd rozbor tohoto unik\u00e1tn\u00edho p\u0159\u00edpadu a nazna\u010duje, \u017ee BD+20 5391 m\u016f\u017ee b\u00fdt vzorov\u00fdm p\u0159\u00edkladem dvojit\u00e9ho v\u00fdvoje \u010derven\u00fdch obr\u016f \u2013 jevem, kter\u00fd dosud zn\u00e1me sp\u00ed\u0161e z teoretick\u00fdch model\u016f ne\u017e z re\u00e1ln\u00fdch dat.<\/p>\n\n\n\n
Dvojhv\u011bzda BD+20 5391 je slo\u017eena ze dvou hv\u011bzd spektr\u00e1ln\u00ed t\u0159\u00eddy K, tedy chladn\u011bj\u0161\u00edch \u010derven\u00fdch obr\u016f, kter\u00e9 se nach\u00e1zej\u00ed asi 500 parsek\u016f od Zem\u011b. Jde o tzv. dvojitou spektroskopickou dvojhv\u011bzdu \u2013 ob\u011b hv\u011bzdy lze rozli\u0161it d\u00edky tomu, \u017ee ve spektru sv\u011btla z jejich syst\u00e9mu se st\u0159\u00eddav\u011b posouvaj\u00ed \u010d\u00e1ry ka\u017ed\u00e9 slo\u017eky v d\u016fsledku Dopplerova efektu. D\u00edky t\u011bmto m\u011b\u0159en\u00edm bylo mo\u017en\u00e9 odvodit p\u0159esnou ob\u011b\u017enou dr\u00e1hu i hmotnost obou slo\u017eek.<\/p>\n\n\n\n
Pozorov\u00e1n\u00ed prob\u00edhala od roku 2020 do roku 2025 na observato\u0159i ASU v Ond\u0159ejov\u011b, tato pozorov\u00e1n\u00ed byla dopln\u011bna je\u0161t\u011b vysokodisperzn\u00edm spektrem z\u00edskan\u00fdm na Mercator Telescope na observato\u0159i La Palma. Celkem bylo z\u00edsk\u00e1no 15 spekter, jejich\u017e prvotn\u00ed zpracov\u00e1n\u00ed se nijak nevymykalo oborov\u00fdm zvyklostem. T\u00edm vznikl soubor velmi p\u0159esn\u00fdch m\u011b\u0159en\u00ed radi\u00e1ln\u00edch rychlost\u00ed obou hv\u011bzd v z\u00e1vislosti na \u010dase.<\/p>\n\n\n\n
Pokra\u010dov\u00e1n\u00ed: web ASU<\/a><\/p>\n\n\n\n V\u00fdvojov\u00e9 diagramy slo\u017eek dvojhv\u011bzdy BD+20 5391. Prvn\u00ed slo\u017eka je ozna\u010dena modrou barvou, druh\u00e1 \u010dervenou. \u010ctvere\u010dky ozna\u010duj\u00ed hodnoty odvozen\u00e9 z modelov\u00e1n\u00ed celkov\u00e9ho spektra obou hv\u011bzd, odpov\u00eddaj\u00ed tedy jejich sou\u010dasn\u00e9 pozici. Troj\u00faheln\u00ed\u010dky pak nazna\u010duj\u00ed, kde pro jednotliv\u00e9 slo\u017eky dojde k vypln\u011bn\u00ed Rocheova laloku a l\u00e1tka za\u010dne p\u0159et\u00e9kat na druhou slo\u017eku. Je velmi dob\u0159e patrn\u00e9, \u017ee v\u00fdvojov\u00e9 stopy i oba zv\u00fdrazn\u011bn\u00e9 okam\u017eiky jsou pro ob\u011b slo\u017eky velmi podobn\u00e9. St\u00ednov\u00e1n\u00ed nazna\u010duje chybov\u00fd interval.<\/em><\/p>\n\n\n\n <\/p>\n","protected":false},"excerpt":{"rendered":" Dvojhv\u011bzda BD+20 5391 se uk\u00e1zala b\u00fdt mimo\u0159\u00e1dn\u011b vz\u00e1cn\u00fdm p\u0159\u00edpadem dvou \u010derven\u00fdch obr\u016f t\u00e9m\u011b\u0159 toto\u017en\u00e9 hmotnosti, kter\u00e9 se vyv\u00edjej\u00ed bok po boku. Nov\u00e1 studie veden\u00e1 t\u00fdmem<\/p>\n","protected":false},"author":1,"featured_media":3539,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[37,32,43],"tags":[],"class_list":["post-3537","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-horke-hvezdy","category-novinky","category-perek-2m"],"_links":{"self":[{"href":"https:\/\/stel.asu.cas.cz\/cs\/wp-json\/wp\/v2\/posts\/3537","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/stel.asu.cas.cz\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/stel.asu.cas.cz\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/stel.asu.cas.cz\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/stel.asu.cas.cz\/cs\/wp-json\/wp\/v2\/comments?post=3537"}],"version-history":[{"count":3,"href":"https:\/\/stel.asu.cas.cz\/cs\/wp-json\/wp\/v2\/posts\/3537\/revisions"}],"predecessor-version":[{"id":3546,"href":"https:\/\/stel.asu.cas.cz\/cs\/wp-json\/wp\/v2\/posts\/3537\/revisions\/3546"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/stel.asu.cas.cz\/cs\/wp-json\/wp\/v2\/media\/3539"}],"wp:attachment":[{"href":"https:\/\/stel.asu.cas.cz\/cs\/wp-json\/wp\/v2\/media?parent=3537"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/stel.asu.cas.cz\/cs\/wp-json\/wp\/v2\/categories?post=3537"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/stel.asu.cas.cz\/cs\/wp-json\/wp\/v2\/tags?post=3537"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}Popis obr\u00e1zku<\/h4>\n\n\n\n
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