Tracking Advanced Planetary Systems (TAPAS) with HARPS-N: II. Super Li-rich giant HD 107028
Entity
UAM. Departamento de Física TeóricaPublisher
EDP SciencesDate
2015-09-01Citation
10.1051/0004-6361/201526582
Astronomy and Astrophysics 581 (2015): A103
ISSN
0004-6361 (print); 1432-0746 (online)DOI
10.1051/0004-6361/201526582Funded by
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 GBMF4561Project
Gobierno de España. AYA2013-45347PEditor's Version
http://dx.doi.org/10.1051/0004-6361/201526582Subjects
Planetary systems; Stars: atmospheres; Stars: fundamental parameters; Stars: individual: HD 107028; Stars: late-type; Techniques: spectroscopic; Astronomía; FísicaNote
Astronomy and Astrophysics 581 (2015): A103 reproduced with permission from Astronomy & AstrophysicsRights
© ESO, 2015Abstract
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
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Google Scholar:Adamow, M.
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Niedzielski, A.
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Villaver Sobrino, Eva Gloria
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Wolszczan, A.
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Kowalik, K.
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Nowak, G.
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Adamczyk, M.
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Deka-Szymankiewicz, B.
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