{"id":2791,"date":"2023-09-07T09:53:11","date_gmt":"2023-09-07T07:53:11","guid":{"rendered":"https:\/\/stel.asu.cas.cz\/cs\/?p=2791"},"modified":"2023-09-07T09:53:11","modified_gmt":"2023-09-07T07:53:11","slug":"dynamika-cirkumbinarni-latky-kolem-podivne-hvezdy-z-cma","status":"publish","type":"post","link":"https:\/\/stel.asu.cas.cz\/cs\/2023\/09\/07\/dynamika-cirkumbinarni-latky-kolem-podivne-hvezdy-z-cma\/","title":{"rendered":"Dynamika cirkumbin\u00e1rn\u00ed l\u00e1tky kolem podivn\u00e9 hv\u011bzdy Z\u00a0CMa"},"content":{"rendered":"\n<p>N\u011bkter\u00e9 hv\u011bzdy jsou skute\u010dn\u011b zvl\u00e1\u0161tn\u00ed a&nbsp;je\u0161t\u011b raritn\u011bj\u0161\u00ed je, pokud dv\u011b neobvykl\u00e9 hv\u011bzdy tvo\u0159\u00ed gravitac\u00ed spjat\u00fd p\u00e1r. Mezi takov\u00e9 pat\u0159\u00ed prom\u011bnn\u00e1 hv\u011bzda Z&nbsp;Canis Majoris, kter\u00e1 byla p\u0159edm\u011btem v\u00fdzkumu veden\u00e9ho Tiinou Liimets ze Stel\u00e1rn\u00edho odd\u011blen\u00ed ASU.<\/p>\n\n\n\n<p>Hv\u011bzda Z\u00a0CMa udivuje astronomy ji\u017e po n\u011bkolik dek\u00e1d. Jde o\u00a0mladou dvojhv\u011bzdu s\u00a0emisn\u00edmi spektr\u00e1ln\u00edmi \u010darami. Prim\u00e1rn\u00ed slo\u017ekou je Herbigova Be hv\u011bzda, tedy hv\u011bzda spektr\u00e1ln\u00edho typu B s\u00a0emisn\u00edmi \u010darami ve st\u00e1diu p\u0159ed n\u00e1stupem na hlavn\u00ed posloupnost, kter\u00e1 je st\u00e1le je\u0161t\u011b obklopena mate\u010dnou mlhovinou. Hmotnost t\u00e9to slo\u017eky pravd\u011bpodobn\u011b odpov\u00edd\u00e1 dvan\u00e1ctin\u00e1sobku hmotnosti Slunce, jej\u00ed rozm\u011br Slunce p\u0159esahuje 1600kr\u00e1t a\u00a0nav\u00edc je asi 2400kr\u00e1t sv\u00edtiv\u011bj\u0161\u00ed. Sekund\u00e1rn\u00ed slo\u017eka je typu FU Orionis, velmi mlad\u00e1 hv\u011bzda op\u011bt p\u0159ed hlavn\u00ed posloupnost\u00ed obklopen\u00e1 akre\u010dn\u00edm diskem s\u00a0masivn\u00ed ale prom\u011bnnou rychlost\u00ed akrece. Tato hv\u011bzda je asi t\u0159ikr\u00e1t hmotn\u011bj\u0161\u00ed, 13kr\u00e1t v\u011bt\u0161\u00ed a\u00a01300kr\u00e1t sv\u00edtiv\u011bj\u0161\u00ed ne\u017e Slunce. Prom\u011bnnost obou slo\u017eek je jen obt\u00ed\u017en\u011b p\u0159edpov\u011bditeln\u00e1, proto asi nen\u00ed p\u0159ekvapen\u00edm, \u017ee tento zvl\u00e1\u0161tn\u00ed p\u00e1r se nepravideln\u011b m\u011bn\u00ed se \u0161k\u00e1lami zm\u011bn jak v\u00a0m\u011bs\u00edc\u00edch a\u017e letech, tak se zm\u011bnami z\u00a0noci na noc. Rozsah sv\u011bteln\u00fdch zm\u011bn dosahuje a\u017e dvou magnitud. Hv\u011bzdy se od sebe nach\u00e1zej\u00ed asi 100 astronomick\u00fdch jednotek, co\u017e na obloze odpov\u00edd\u00e1 desetin\u011b obloukov\u00e9 vte\u0159iny.<\/p>\n\n\n\n<p><a href=\"https:\/\/www.asu.cas.cz\/articles\/2154\/19\/na-cem-pracujeme-dynamika-cirkumbinarni-latky-kolem-podivne-hvezdy-z-cma\" data-type=\"URL\" data-id=\"https:\/\/www.asu.cas.cz\/articles\/2154\/19\/na-cem-pracujeme-dynamika-cirkumbinarni-latky-kolem-podivne-hvezdy-z-cma\" target=\"_blank\" rel=\"noreferrer noopener\">Pokra\u010dov\u00e1n\u00ed na webu ASU<\/a><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>P\u0159evzato: <a rel=\"noreferrer noopener\" href=\"https:\/\/www.asu.cas.cz\/articles\/2154\/19\/na-cem-pracujeme-dynamika-cirkumbinarni-latky-kolem-podivne-hvezdy-z-cma\" target=\"_blank\">Na \u010dem pracujeme: Dynamika cirkumbin\u00e1rn\u00ed l\u00e1tky kolem podivn\u00e9 hv\u011bzdy Z\u00a0CMa<\/a>, autor M. \u0160vanda<\/li>\n\n\n\n<li>Origin\u00e1l pr\u00e1ce: T. Liimets, M. Kraus a\u00a0kol., <em>Large-Scale Ejecta of Z\u00a0CMa\u2014Proper Motion Study and New Features Discovered<\/em>, <a rel=\"noreferrer noopener\" href=\"https:\/\/ui.adsabs.harvard.edu\/abs\/2023Galax..11...64L\/abstract\" target=\"_blank\">Galaxies 11 (2023) 64, preprint arXiv:2305.03080<\/a><\/li>\n\n\n\n<li>Kontakt:\u00a0Dr. Tiina Liimets, Ph.D., tiina.liimets@asu.cas.cz<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>N\u011bkter\u00e9 hv\u011bzdy jsou skute\u010dn\u011b zvl\u00e1\u0161tn\u00ed a&nbsp;je\u0161t\u011b raritn\u011bj\u0161\u00ed je, pokud dv\u011b neobvykl\u00e9 hv\u011bzdy tvo\u0159\u00ed gravitac\u00ed spjat\u00fd p\u00e1r. Mezi takov\u00e9 pat\u0159\u00ed prom\u011bnn\u00e1 hv\u011bzda Z&nbsp;Canis Majoris, kter\u00e1 byla<\/p>\n","protected":false},"author":1,"featured_media":2792,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[37,32],"tags":[],"class_list":["post-2791","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-horke-hvezdy","category-novinky"],"_links":{"self":[{"href":"https:\/\/stel.asu.cas.cz\/cs\/wp-json\/wp\/v2\/posts\/2791","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=2791"}],"version-history":[{"count":1,"href":"https:\/\/stel.asu.cas.cz\/cs\/wp-json\/wp\/v2\/posts\/2791\/revisions"}],"predecessor-version":[{"id":2793,"href":"https:\/\/stel.asu.cas.cz\/cs\/wp-json\/wp\/v2\/posts\/2791\/revisions\/2793"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/stel.asu.cas.cz\/cs\/wp-json\/wp\/v2\/media\/2792"}],"wp:attachment":[{"href":"https:\/\/stel.asu.cas.cz\/cs\/wp-json\/wp\/v2\/media?parent=2791"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/stel.asu.cas.cz\/cs\/wp-json\/wp\/v2\/categories?post=2791"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/stel.asu.cas.cz\/cs\/wp-json\/wp\/v2\/tags?post=2791"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}