{"id":1456,"date":"2020-06-21T09:13:56","date_gmt":"2020-06-21T08:13:56","guid":{"rendered":"https:\/\/pepsi.aip.de\/?p=1456"},"modified":"2022-01-19T08:56:26","modified_gmt":"2022-01-19T07:56:26","slug":"lithium-in-t-corona-borealis","status":"publish","type":"post","link":"https:\/\/pepsi.aip.de\/?p=1456","title":{"rendered":"Lithium in T Corona Borealis"},"content":{"rendered":"<div class=\"page\" title=\"Page 1\">\n<div class=\"layoutArea\">\n<div class=\"column\">T Coronae Borealis is a recurrent, symbiotic nova system currently in quiescence between its periodic \u224d80 yr cycle of eruptions. Observations during inter-outburst epochs provide an opportunity to study properties of the accretion disk and the M red giant. Here we present new irradiated (blackbody veiling) models, incorporating modern molecular opacities and line lists, of spectra derived from high-resolution (22,000 \u2272 R \u2272 120,000) optical echelle observations obtained at two epochs, one prior to and one post the 2015 rebrightening event at similar spectroscopic system phase. We find a lithium abundance in the secondary at both epochs to be comparable. The non-irradiated (classical) model atmospheres yield a lithium abundance, A(Li) = 1.3 \u00b1 0.1. The irradiated model (veiled) atmospheres, which are likely a better representation of the system in which the white dwarf and accretion disk illuminate the red giant, give A(Li) = 2.4 \u00b1 0.1.<\/div>\n<\/div>\n<\/div>\n<!-- \/wp:post-content -->\n\n<!-- wp:image {\"id\":993} -->\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-1455\" src=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2020\/06\/T_CrB_Li-300x221.png\" alt=\"\" width=\"800\" height=\"589\" srcset=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2020\/06\/T_CrB_Li-300x221.png 300w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2020\/06\/T_CrB_Li-768x566.png 768w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2020\/06\/T_CrB_Li.png 880w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/>\n<figcaption>PEPSI spectrum around 6708 \u00c5 Li I resonance doublet in T CrB (red line), which is highly broadened by macro-turbulence. The green line is \u00a0a classical 1D model atmosphere fit and the blue line an irradiated \u00a0model fit.\n.<\/figcaption><\/figure>\nRead more: <a href=\"https:\/\/ui.adsabs.harvard.edu\/abs\/2020AJ....159..231W\/abstract\">Woodward et al., 2020, AJ, 159, 231<\/a>","protected":false},"excerpt":{"rendered":"<p>T Coronae Borealis is a recurrent, symbiotic nova system currently in quiescence between its periodic \u224d80 yr cycle of eruptions. Observations during inter-outburst epochs provide an opportunity to study properties of the accretion disk and the M red giant. Here we present new irradiated (blackbody veiling) models, incorporating modern molecular opacities and line lists, of &hellip; <a href=\"https:\/\/pepsi.aip.de\/?p=1456\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Lithium in T Corona Borealis<\/span> <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"class_list":["post-1456","post","type-post","status-publish","format-standard","hentry","category-publications"],"_links":{"self":[{"href":"https:\/\/pepsi.aip.de\/index.php?rest_route=\/wp\/v2\/posts\/1456","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pepsi.aip.de\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/pepsi.aip.de\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/pepsi.aip.de\/index.php?rest_route=\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/pepsi.aip.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1456"}],"version-history":[{"count":4,"href":"https:\/\/pepsi.aip.de\/index.php?rest_route=\/wp\/v2\/posts\/1456\/revisions"}],"predecessor-version":[{"id":1903,"href":"https:\/\/pepsi.aip.de\/index.php?rest_route=\/wp\/v2\/posts\/1456\/revisions\/1903"}],"wp:attachment":[{"href":"https:\/\/pepsi.aip.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1456"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/pepsi.aip.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1456"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/pepsi.aip.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1456"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}