{"@context":{"@vocab":"https://cir.nii.ac.jp/schema/1.0/","rdfs":"http://www.w3.org/2000/01/rdf-schema#","dc":"http://purl.org/dc/elements/1.1/","dcterms":"http://purl.org/dc/terms/","foaf":"http://xmlns.com/foaf/0.1/","prism":"http://prismstandard.org/namespaces/basic/2.0/","cinii":"http://ci.nii.ac.jp/ns/1.0/","datacite":"https://schema.datacite.org/meta/kernel-4/","ndl":"http://ndl.go.jp/dcndl/terms/","jpcoar":"https://github.com/JPCOAR/schema/blob/master/2.0/"},"@id":"https://cir.nii.ac.jp/crid/1360002217650790016.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1093/pasj/psv054"}},{"identifier":{"@type":"URI","@value":"https://academic.oup.com/pasj/article-pdf/67/5/85/54682526/pasj_67_5_85.pdf"}},{"identifier":{"@type":"DOI","@value":"10.48550/arxiv.1505.06050"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@value":"High dispersion spectroscopy of solar-type superflare stars. III. Lithium abundances"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:title>Abstract</jats:title>\n               <jats:p>We report on the abundance analysis of Li in solar-type (G-type main sequence) superflare stars which were found by the analysis of Kepler photometric data. Li is a key element to understand the evolution of the stellar convection zone, which reflects the age of solar-type stars. We performed the high-dispersion spectroscopy of solar-type superflare stars with Subaru/High Dispersion Spectrograph and confirmed that 34 stars show no evidence of binarity in our previous study. In this study, we derived the Li abundances of these 34 objects. We investigate correlations of Li abundance with stellar atmospheric parameters, rotational velocity, and superflare activities to understand the nature of superflare stars and the possibility of the nucleosynthesis of Li by superflares. We confirm the large dispersion in the Li abundance, and the correlation with stellar parameters is not seen. When compared with the Li abundance in the Hyades cluster, which is younger than the Sun, it is suggested that half of the observed stars are younger than Hyades cluster. The measured value of v sin i (projected rotational velocity) supports that those objects are younger than the Sun. However, there are some objects which show the low Li abundance and slowly rotate on the basis of the estimated v sin i and P (period of brightness variation). This result indicates that superflare stars are not only young stars but also old stars like our Sun. In our observations, we could not find any evidence of Li production by superflares. Further research on Li isotope abundances of superflare stars would clarify the issue of Li production by stellar flares.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1420564276171782400","@type":"Researcher","personIdentifier":[{"@type":"KAKEN_RESEARCHERS","@value":"20425408"},{"@type":"NRID","@value":"1000020425408"},{"@type":"NRID","@value":"9000248219272"},{"@type":"NRID","@value":"9000002596396"},{"@type":"NRID","@value":"9000003394539"},{"@type":"NRID","@value":"9000290358469"},{"@type":"NRID","@value":"9000244901779"},{"@type":"NRID","@value":"9000242546866"},{"@type":"NRID","@value":"9000250471627"},{"@type":"NRID","@value":"9000244901434"},{"@type":"NRID","@value":"9000016865590"},{"@type":"NRID","@value":"9000323844369"},{"@type":"NRID","@value":"9000346921244"},{"@type":"NRID","@value":"9000010083794"},{"@type":"NRID","@value":"9000002214063"},{"@type":"NRID","@value":"9000346921348"},{"@type":"NRID","@value":"9000023738902"},{"@type":"NRID","@value":"9000237870355"},{"@type":"NRID","@value":"9000315143732"},{"@type":"NRID","@value":"9000001815898"},{"@type":"NRID","@value":"9000237870896"},{"@type":"NRID","@value":"9000014152172"},{"@type":"NRID","@value":"9000250750334"},{"@type":"NRID","@value":"9000003804692"},{"@type":"NRID","@value":"9000398834551"},{"@type":"RESEARCHMAP","@value":"https://researchmap.jp/hondast"}],"foaf:name":[{"@value":"Satoshi 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Shibata"}],"jpcoar:affiliationName":[{"@value":"5Kwasan Observatory, Kyoto University, Yamashina-ku, Kyoto, Kyoto 607-8471, Japan"}]}],"publication":{"publicationIdentifier":[{"@type":"EISSN","@value":"2053051X"},{"@type":"PISSN","@value":"00046264"}],"prism:publicationName":[{"@value":"Publications of the Astronomical Society of Japan"}],"dc:publisher":[{"@value":"Oxford University Press (OUP)"}],"prism:publicationDate":"2015-07-07","prism:volume":"67","prism:number":"5","prism:startingPage":"85"},"reviewed":"false","url":[{"@id":"https://academic.oup.com/pasj/article-pdf/67/5/85/54682526/pasj_67_5_85.pdf"}],"createdAt":"2015-07-09","modifiedAt":"2023-12-20","foaf:topic":[{"@id":"https://cir.nii.ac.jp/all?q=Astrophysics%20-%20Solar%20and%20Stellar%20Astrophysics","dc:title":"Astrophysics - Solar and Stellar Astrophysics"},{"@id":"https://cir.nii.ac.jp/all?q=FOS:%20Physical%20sciences","dc:title":"FOS: Physical sciences"},{"@id":"https://cir.nii.ac.jp/all?q=Solar%20and%20Stellar%20Astrophysics%20(astro-ph.SR)","dc:title":"Solar and Stellar Astrophysics (astro-ph.SR)"}],"project":[{"@id":"https://cir.nii.ac.jp/crid/1040000782242883200","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"25287039"},{"@type":"JGN","@value":"JP25287039"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-25287039/"}],"notation":[{"@language":"ja","@value":"太陽白色光フレアと太陽型星スーパーフレアの比較研究"},{"@language":"en","@value":"Solar White Light Flares and Superflares on Solar-type Stars"}]},{"@id":"https://cir.nii.ac.jp/crid/1040282257274126976","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"26400231"},{"@type":"JGN","@value":"JP26400231"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-26400231/"}],"notation":[{"@language":"ja","@value":"スーパーフレア星の化学組成から探る元素合成の研究"},{"@language":"en","@value":"Nucleosynthesis studies from the chmical abundances of superflare stars"}]},{"@id":"https://cir.nii.ac.jp/crid/1040282257293082624","@type":"Project","projectIdentifier":[{"@type":"KAKEN","@value":"26800096"},{"@type":"JGN","@value":"JP26800096"},{"@type":"URI","@value":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-26800096/"}],"notation":[{"@language":"ja","@value":"広視野測光サーベイとアーカイブデータの活用による活動的な太陽型星の探査"},{"@language":"en","@value":"Survey of active solar-type stars with the wide-filed photometric observations and archival data"}]}],"relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1050282810809482624","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["references"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Statistical properties of superflares on solar-type stars based on 1-min cadence data"}]},{"@id":"https://cir.nii.ac.jp/crid/1050856893077653760","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["references"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Coalescence of 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