{"id":3286,"date":"2023-01-04T10:56:57","date_gmt":"2023-01-04T09:56:57","guid":{"rendered":"https:\/\/stel.asu.cas.cz\/en\/?p=3286"},"modified":"2023-01-24T17:03:18","modified_gmt":"2023-01-24T16:03:18","slug":"observations-and-modeling-of-spectral-line-asymmetries-in-stellar-flares","status":"publish","type":"post","link":"https:\/\/stel.asu.cas.cz\/en\/2023\/01\/04\/observations-and-modeling-of-spectral-line-asymmetries-in-stellar-flares\/","title":{"rendered":"Observations and modeling of spectral line asymmetries in stellar flares"},"content":{"rendered":"\n<p>Astronomers from Astronomical Institute (AI) in Ond\u0159ejov studied the red dwarf star <strong>AD Leonis<\/strong>, which is known for its significant <strong>flaring activity<\/strong>. They coordinated the observing campaign and obtained the <strong>time series of the spectra <\/strong>around the H\u03b1 hydrogen line region during the ongoing flare. The spectra revealed a significant red asymmetry indicating the movement of matter from the upper atmosphere of the star to the lower layers. The authors constructed a geometric model to explain this asymmetry. <\/p>\n\n\n\n<p>AD Leonis is a relatively bright star, so it is within reach of smaller telescopes. Petr Heinzel, his student Ji\u0159\u00ed Wollmann and Petr Kab\u00e1th from the <strong>Stellar Department<\/strong> of AI used high-quality photometric data taken by observers of the <strong>Variable Stars and Exoplanets Section of the Czech Astronomical Society<\/strong>. The star&#8217;s brightness also guarantees the possibility of acquiring a high-resolution spectra using the <strong>OES echelle spectrograph<\/strong> fed by the <strong>Perek 2-meter Telescope<\/strong>. Photometric and spectroscopic data were acquired in three observation campaigns that took place in the spring of 2019, 2020 and 2021. The campaigns were successful and it was possible to obtain quality data for studying the characteristics of flares on this star. Details can be found on the ASU website (in Czech) of in original paper (see links).<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Links and contact:<\/h4>\n\n\n\n<ul class=\"wp-block-list\"><li>popular text, AI web page: <a rel=\"noreferrer noopener\" href=\"https:\/\/www.asu.cas.cz\/articles\/2042\/19\/na-cem-pracujeme-pozorovani-a-modelovani-asymetrie-spektralnich-car-ve-hvezdne-erupci\" target=\"_blank\">Na \u010dem pracujeme: Pozorov\u00e1n\u00ed a&nbsp;modelov\u00e1n\u00ed asymetrie spektr\u00e1ln\u00edch \u010dar ve hv\u011bzdn\u00e9 erupci<\/a> (M. \u0160vanda, in Czech)<\/li><li>scientific paper: J. Wollmann, P. Heinzel and&nbsp;P. Kab\u00e1th, <em>Observations and modeling of spectral line asymmetries in stellar flares<\/em>, Astronomy &amp; Astrophysics, in press, <a rel=\"noreferrer noopener\" href=\"https:\/\/arxiv.org\/abs\/2211.07402\" target=\"_blank\">arXiv:2211.07402<\/a><\/li><li>Contact: prof. RNDr. Petr Heinzel, DrSc. (pheinzel@asu.cas.cz), Mgr. Ji\u0159\u00ed Wollmann (jiri.wollmann@asu.cas.cz), <a href=\"https:\/\/stel.asu.cas.cz\/cs\/vyzkum-extrasolarnich-planet\/lide\/#kabath\">Petr Kab\u00e1th<\/a><\/li><\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Astronomers from Astronomical Institute (AI) in Ond\u0159ejov studied the red dwarf star AD Leonis, which is known for its significant flaring activity. They coordinated the<\/p>\n","protected":false},"author":1,"featured_media":3288,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[42,35,49],"tags":[],"class_list":["post-3286","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-department","category-news","category-perek-2m"],"_links":{"self":[{"href":"https:\/\/stel.asu.cas.cz\/en\/wp-json\/wp\/v2\/posts\/3286","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/stel.asu.cas.cz\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/stel.asu.cas.cz\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/stel.asu.cas.cz\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/stel.asu.cas.cz\/en\/wp-json\/wp\/v2\/comments?post=3286"}],"version-history":[{"count":2,"href":"https:\/\/stel.asu.cas.cz\/en\/wp-json\/wp\/v2\/posts\/3286\/revisions"}],"predecessor-version":[{"id":3289,"href":"https:\/\/stel.asu.cas.cz\/en\/wp-json\/wp\/v2\/posts\/3286\/revisions\/3289"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/stel.asu.cas.cz\/en\/wp-json\/wp\/v2\/media\/3288"}],"wp:attachment":[{"href":"https:\/\/stel.asu.cas.cz\/en\/wp-json\/wp\/v2\/media?parent=3286"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/stel.asu.cas.cz\/en\/wp-json\/wp\/v2\/categories?post=3286"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/stel.asu.cas.cz\/en\/wp-json\/wp\/v2\/tags?post=3286"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}