{"id":1650,"date":"2021-11-24T13:42:17","date_gmt":"2021-11-24T12:42:17","guid":{"rendered":"https:\/\/stel.asu.cas.cz\/cs\/?p=1650"},"modified":"2022-03-02T13:27:41","modified_gmt":"2022-03-02T12:27:41","slug":"je-hvezda-12-vul-chybejicim-clankem-mezi-skupinami-be-a-be","status":"publish","type":"post","link":"https:\/\/stel.asu.cas.cz\/cs\/2021\/11\/24\/je-hvezda-12-vul-chybejicim-clankem-mezi-skupinami-be-a-be\/","title":{"rendered":"Je hv\u011bzda &#8217;12 Vul&#8216; chyb\u011bj\u00edc\u00edm \u010dl\u00e1nkem mezi skupinami Be a B[e]?"},"content":{"rendered":"\n<p>T\u0159\u00edda hork\u00fdch hv\u011bzd spektr\u00e1ln\u00edho<strong> typu B<\/strong> se d\u011bl\u00ed na \u0159adu podskupin mezi n\u011b\u017e pat\u0159\u00ed jednak <strong>klasick\u00e9 Be hv\u011bzdy<\/strong> (s emisn\u00edmi \u010darami Balmerovy s\u00e9rie ve spektru) a tak\u00e9 o n\u011bco <strong>vz\u00e1cn\u011bj\u0161\u00ed B[e] hv\u011bzdy<\/strong> (nav\u00edc se zak\u00e1zan\u00fdmi \u010darami). Ob\u011b tyto skupiny vykazuj\u00ed zn\u00e1mky p\u0159\u00edtomnosti <strong>okolohv\u011bzdn\u00fdch disk\u016f<\/strong>. Disky kolem Be hv\u011bzd tvo\u0159\u00ed ionizovan\u00fd plyn, kter\u00fd se uvolnil z povrchu t\u011bchto rychle rotuj\u00edc\u00edch objekt\u016f. Plyn je mo\u017en\u00e9 zkoumat spektroskopicky na z\u00e1klad\u011b rozdvojen\u00e9ho profilu vod\u00edkov\u00fdch emisn\u00edch \u010dar. Naproti tomu o mechanizmu vzniku disk\u016f u B[e] hv\u011bzd nen\u00ed zn\u00e1mo prakticky nic. Disky jsou v\u0161ak v\u011bt\u0161inou natolik hust\u00e9, \u017ee v nich m\u016f\u017ee doch\u00e1zet ke vzniku molekul a kondenzaci prachu.<\/p>\n\n\n\n<p>V\u011bde\u010dt\u00ed pracovn\u00edci Stel\u00e1rn\u00edho odd\u011blen\u00e9 Astronomick\u00e9ho \u00fastavu AV \u010cR ve spolupr\u00e1ci s kolegy z Argentiny <a rel=\"noreferrer noopener\" href=\"https:\/\/ui.adsabs.harvard.edu\/abs\/2021A%26A%E2%80%A6647A.164C\/abstract\" target=\"_blank\">v ned\u00e1vno publikovan\u00e9 studii<\/a> uk\u00e1zali, \u017ee jasn\u00e1 hv\u011bzda <strong>12 Vulpeculae<\/strong> (12 Vul) v souhv\u011bzd\u00ed Li\u0161ti\u010dka by mohla b\u00fdt prvn\u00edm zn\u00e1m\u00fdm objektem, kter\u00fd jev\u00ed zn\u00e1mky obou t\u0159\u00edd &#8211; Be i B[e]. N\u011bkdy je mo\u017en\u00e9 v jej\u00edm infra\u010derven\u00e9m spektru zaznamenat siln\u00e9 emise ionizovan\u00e9ho plynu a jindy pouze slab\u00e9 emisn\u00ed \u010d\u00e1ry molekul. Hv\u011bzda 12 Vul je sou\u010d\u00e1st\u00ed pravideln\u00e9ho pozorovac\u00edho programu <strong>Perkova dalekohledu<\/strong> pr\u00e1v\u011b proto, \u017ee by mohla p\u0159edstavovat <strong>chyb\u011bj\u00edc\u00ed \u010dl\u00e1nek<\/strong> mezi klasick\u00fdmi Be hv\u011bzdami a t\u0159\u00eddou B[e].<\/p>\n\n\n\n<p>Pozorov\u00e1n\u00ed hv\u011bzdy 12 Vul z\u00edskan\u00e1 pomoc\u00ed Perkova dalekohledu v \u0159\u00edjnu roku 2021 uk\u00e1zala ve spektru <strong>siln\u00e9 rozdvojen\u00e9 emisn\u00ed \u010d\u00e1ry vod\u00edku<\/strong>. D\u00edky koordinovan\u00e9 mezin\u00e1rodn\u00ed spolupr\u00e1ci <a rel=\"noreferrer noopener\" href=\"https:\/\/stel.asu.cas.cz\/~kraus\/POEMS\/\" target=\"_blank\">v r\u00e1mci projektu POEMS<\/a> po\u0159\u00eddili kr\u00e1tce nato Argentin\u0161t\u00ed kolegov\u00e9 tak\u00e9 spektra v infra\u010derven\u00e9 oblasti pomoc\u00ed teleskopu <strong>GEMINI<\/strong>. Na z\u00e1klad\u011b t\u011bchto dat bude nyn\u00ed mo\u017en\u00e9 zkoumat, jak\u00fdm zp\u016fsobem je v\u00fdskyt vod\u00edkov\u00e9 emise spojen se vznikem molekul\u00e1rn\u00edch \u010dar a pochopit mechanismy formov\u00e1n\u00ed disk\u016f kolem B[e] hv\u011bzd.<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>v\u011bdeck\u00fd \u010dl\u00e1nek <a rel=\"noreferrer noopener\" href=\"https:\/\/arxiv.org\/abs\/2103.01699\" target=\"_blank\">Intriguing detection of 12CO molecular emission in a classical Be star<\/a> <\/li><li><a href=\"https:\/\/stel.asu.cas.cz\/~kraus\/POEMS\/\" target=\"_blank\" rel=\"noreferrer noopener\">POEMS project<\/a><\/li><\/ul>\n\n\n\n<p>Contact: <a href=\"https:\/\/stel.asu.cas.cz\/cs\/fyzika-horkych-hvezd\/lide\/#kraus\">Michaela Kraus<\/a>, <a href=\"https:\/\/stel.asu.cas.cz\/cs\/fyzika-horkych-hvezd\/lide\/#maryeva\">Olga Maryeva<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>T\u0159\u00edda hork\u00fdch hv\u011bzd spektr\u00e1ln\u00edho typu B se d\u011bl\u00ed na \u0159adu podskupin mezi n\u011b\u017e pat\u0159\u00ed jednak klasick\u00e9 Be hv\u011bzdy (s emisn\u00edmi \u010darami Balmerovy s\u00e9rie ve spektru)<\/p>\n","protected":false},"author":1,"featured_media":1652,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[37,32],"tags":[],"class_list":["post-1650","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\/1650","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=1650"}],"version-history":[{"count":2,"href":"https:\/\/stel.asu.cas.cz\/cs\/wp-json\/wp\/v2\/posts\/1650\/revisions"}],"predecessor-version":[{"id":1656,"href":"https:\/\/stel.asu.cas.cz\/cs\/wp-json\/wp\/v2\/posts\/1650\/revisions\/1656"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/stel.asu.cas.cz\/cs\/wp-json\/wp\/v2\/media\/1652"}],"wp:attachment":[{"href":"https:\/\/stel.asu.cas.cz\/cs\/wp-json\/wp\/v2\/media?parent=1650"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/stel.asu.cas.cz\/cs\/wp-json\/wp\/v2\/categories?post=1650"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/stel.asu.cas.cz\/cs\/wp-json\/wp\/v2\/tags?post=1650"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}