{"id":1960,"date":"2022-11-07T07:52:02","date_gmt":"2022-11-07T06:52:02","guid":{"rendered":"https:\/\/pepsi.aip.de\/?p=1960"},"modified":"2023-02-08T15:13:01","modified_gmt":"2023-02-08T14:13:01","slug":"on-the-lithium-abundance-of-the-visual-binary-components%ce%be-boo-a-g8v-and-%ce%be-boo-b-k5v","status":"publish","type":"post","link":"https:\/\/pepsi.aip.de\/?p=1960","title":{"rendered":"On the lithium abundance of the visual binary components ksi Boo A (G8V) and ksi Boo B (K5V)"},"content":{"rendered":"\n<p>A spectroscopic investigation of the lithium resonance doublet in \u03be Boo A and \u03be Boo B in terms of both abundance and isotopic ratio is presented. We obtained new R=130 000 spectra with a signal-to-noise ratio (S\/N) per pixel of up to 3200 using the 11.8m LBT and PEPSI. From fits with synthetic line profiles based on 1D-LTE MARCS model atmospheres and 3D-NLTE corrections, we determine the abundances of both isotopes. For \u03be Boo A, we find A(Li) = 2.40\u00b10.03 dex and <sup>6<\/sup>Li\/<sup>7<\/sup>Li &lt; 1.5\u00b11.0 % in 1D LTE, which increases to \u22482.45 for the 3D-NLTE case. For \u03be Boo B we obtain A(Li) = 0.37\u00b10.09 dex in 1D-LTE with an unspecified <sup>6<\/sup>Li\/<sup>7<\/sup>Li level. Therefore, no <sup>6<\/sup>Li is seen on any of the two stars. We consider a spot model for the Li fit for \u03be Boo B and find A(Li) = 0.45\u00b10.09 dex. The <sup>7<\/sup>Li abundance is 23 times higher for \u03be Boo A than the Sun\u2019s, but three times lower than the Sun\u2019s for \u03be Boo B while both fit the trend of single stars in the similar-aged M35 open cluster. Effective temperatures are redetermined from the TiO band head strength. We note that the best-fit global metallicities are \u20130.13\u00b10.01 dex for \u03be Boo A but +0.13\u00b10.02 dex for \u03be Boo B. Lithium abundance for the K5V benchmark star 61 Cyg A was obtained to A(Li)\u22480.53 dex when including a spot model but to \u22480.15 dex without a spot model.<\/p>\n\n\n\n<figure id=\"attachment_1959\" aria-describedby=\"caption-attachment-1959\" style=\"width: 1280px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2022\/11\/F1_Li.png\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-1959 size-full\" src=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2022\/11\/F1_Li.png\" alt=\"\" width=\"1280\" height=\"720\" srcset=\"https:\/\/pepsi.aip.de\/wp-content\/uploads\/2022\/11\/F1_Li.png 1280w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2022\/11\/F1_Li-300x169.png 300w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2022\/11\/F1_Li-1024x576.png 1024w, https:\/\/pepsi.aip.de\/wp-content\/uploads\/2022\/11\/F1_Li-768x432.png 768w\" sizes=\"auto, (max-width: 1280px) 100vw, 1280px\" \/><\/a><figcaption id=\"caption-attachment-1959\" class=\"wp-caption-text\">Lithium 6708 \u00c5 of \u03be Boo A (black dots) and \u03be Boo B (red dots). The wavelengths of the two doublets from the two lithium isotopes are marked as vertical lines. Also indicated are the blending features from the line list of Mel\u00e9ndez et al. (2012). Additional molecular features from the sunspot umbral spectrum of Wallace et al. (1999) are indicated as well.<\/figcaption><\/figure>\n\n\n\n<p>Read more: <a href=\"https:\/\/ui.adsabs.harvard.edu\/abs\/2022AN....34320036S\/abstract\">Strassmeier &amp; Steffen 2022, AN, 343, article id. e20220036<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>A spectroscopic investigation of the lithium resonance doublet in \u03be Boo A and \u03be Boo B in terms of both abundance and isotopic ratio is presented. We obtained new R=130 000 spectra with a signal-to-noise ratio (S\/N) per pixel of up to 3200 using the 11.8m LBT and PEPSI. From fits with synthetic line profiles &hellip; <a href=\"https:\/\/pepsi.aip.de\/?p=1960\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">On the lithium abundance of the visual binary components ksi Boo A (G8V) and ksi Boo B (K5V)<\/span> <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"class_list":["post-1960","post","type-post","status-publish","format-standard","hentry","category-publications"],"_links":{"self":[{"href":"https:\/\/pepsi.aip.de\/index.php?rest_route=\/wp\/v2\/posts\/1960","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=1960"}],"version-history":[{"count":5,"href":"https:\/\/pepsi.aip.de\/index.php?rest_route=\/wp\/v2\/posts\/1960\/revisions"}],"predecessor-version":[{"id":2034,"href":"https:\/\/pepsi.aip.de\/index.php?rest_route=\/wp\/v2\/posts\/1960\/revisions\/2034"}],"wp:attachment":[{"href":"https:\/\/pepsi.aip.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1960"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/pepsi.aip.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1960"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/pepsi.aip.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1960"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}