Tracking Advanced Planetary Systems (TAPAS) with HARPS-N: II. Super Li-rich giant HD 107028

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Show simple item record Adamow, M. Niedzielski, A. Villaver, Eva Wolszczan, A. Kowalik, K. Nowak, G. Adamczyk, M. Deka-Szymankiewicz, B.
dc.contributor.other UAM. Departamento de Física Teórica es_ES 2016-05-26T11:36:46Z 2016-05-26T11:36:46Z 2015-09-01
dc.identifier.citation Astronomy and Astrophysics 581 (2015): A103 en_US
dc.identifier.issn 0004-6361 (print) es_ES
dc.identifier.issn 1432-0746 (online) es_ES
dc.description Astronomy and Astrophysics 581 (2015): A103 reproduced with permission from Astronomy & Astrophysics en_US
dc.description.abstract Context. Lithium-rich giant stars are rare objects. For some of them, Li enrichment exceeds the abundance of this element found in solar system meteorites, suggesting that these stars have gone through a Li enhancement process. Aims. We identified a Li-rich giant HD 107028 with A(Li) > 3.3 in a sample of evolved stars observed within the PennState Toruń Planet Search. In this work we study different enhancement scenarios and we try to identify the one responsible for Li enrichment in HD 107028. Methods. We collected high-resolution spectra with three different instruments, covering different spectral ranges. We determined stellar parameters and abundances of selected elements with both equivalent width measurements and analysis, and spectral synthesis. We also collected multi-epoch high-precision radial velocities in an attempt to detect a companion. Results. Collected data show that HD 107028 is a star at the base of the red giant branch (RGB). Except for high Li abundance, we have not identified any other anomalies in its chemical composition, and there is no indication of a low-mass or stellar companion. We exclude Li production at the luminosity function bump on the RGB as the effective temperature and luminosity suggest that the evolutionary state is much earlier than the RGB bump. We also cannot confirm the Li enhancement by contamination as we do not observe any anomalies that are associated with this scenario. Conclusions. After evaluating various scenarios of Li enhancement we conclude that the Li-overabundance of HD 107028 originates from main-sequence evolution, and may be caused by diffusion processes en_US
dc.description.sponsorship M.A. acknowledges the Mobility+III fellowship from the Polish Ministry of Science and Higher Education. M.A., A.N., B.D. and MiA were supported by the Polish National Science Centre grant No. UMO-2012/07/B/ST9/04415. E.V. acknowledges support from the Spanish Ministerio de Economía y Competitividad under grant AYA2013-45347P. K.K. was funded in part by the Gordon and Betty Moore Foundation’s Data-Driven Discovery Initiative through Grant GBMF4561 en_US
dc.format.extent 9 pag. es_ES
dc.format.mimetype application/pdf en
dc.language.iso eng en
dc.publisher EDP Sciences en_US
dc.relation.ispartof Astronomy and Astrophysics en_US
dc.rights © ESO, 2015 en_US
dc.subject.other Planetary systems en_US
dc.subject.other Stars: atmospheres en_US
dc.subject.other Stars: fundamental parameters en_US
dc.subject.other Stars: individual: HD 107028 en_US
dc.subject.other Stars: late-type en_US
dc.subject.other Techniques: spectroscopic en_US
dc.title Tracking Advanced Planetary Systems (TAPAS) with HARPS-N: II. Super Li-rich giant HD 107028 en_US
dc.type article en
dc.subject.eciencia Astronomía es_ES
dc.subject.eciencia Física es_ES
dc.relation.publisherversion es_ES
dc.identifier.doi 10.1051/0004-6361/201526582 es_ES
dc.identifier.publicationfirstpage A103 es_ES
dc.identifier.publicationlastpage A103 es_ES
dc.identifier.publicationvolume 581 es_ES
dc.relation.projectID Gobierno de España. AYA2013-45347P es_ES
dc.type.version info:eu-repo/semantics/publishedVersion en
dc.rights.accessRights openAccess en
dc.authorUAM Villaver Sobrino, Eva Gloria (262057)

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