The nature of the Li enrichment in the most Li-rich giant star
| العنوان: | The nature of the Li enrichment in the most Li-rich giant star |
|---|---|
| المؤلفون: | Yongshou Chen, Weiping Liu, Jianrong Shi, Shao-Lan Bi, Hong-Liang Yan, Qi Gao, Haining Li, Yaqian Wu, Gang Zhao, Zhihong Li, Ze-Ming Zhou, Er-Tao Li, Bing Guo, Junbo Zhang, Yu-Tao Zhou, Suyalatu Zhang |
| سنة النشر: | 2018 |
| مصطلحات موضوعية: | Physics, Red giant, Stellar atmosphere, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, Giant star, 01 natural sciences, Galaxy, Accretion (astrophysics), Luminosity, Red-giant branch, Astrophysics - Solar and Stellar Astrophysics, 0103 physical sciences, 010306 general physics, 010303 astronomy & astrophysics, Stellar evolution, Solar and Stellar Astrophysics (astro-ph.SR) |
| الوصف: | About one percent of giants\upcite{Brown1989} are detected to have anomalously high lithium (Li) abundances in their atmospheres, conflicting directly with the prediction of the standard stellar evolution models\upcite{Iben1967}, and making the production and evolution of Li more intriguing, not only in the sense of the Big Bang nucleosynthesis\upcite{Cyburt2016,Spite1982} or the Galactic medium\upcite{Tajitsu2015}, but also the evolution of stars. Decades of efforts have been put into explaining why such outliers exist\upcite{Sackmann1999, Denissenkov2004, Charbonnel2010}, yet the origins of Li-rich giants are still being debated. Here we report the discovery of the most Li-rich giant known to date, with a super-high Li abundance of 4.51. This rare phenomenon was snapshotted together with another short-term event that the star is experiencing its luminosity bump on the red giant branch. Such high Li abundance indicates that the star might be at the very beginning of its Li-rich phase, which provides a great opportunity to investigate the origin and evolution of Li in the Galaxy. A detailed nuclear simulation is presented with up-to-date reaction rates to recreate the Li enriching process in this star. Our results provide tight constraints on both observational and theoretical points of view, suggesting that low-mass giants can produce Li inside themselves to a super high level via $^{7}$Be transportation during the red giant phase. 17 pages, 6 figures |
| اللغة: | English |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a2e57280e91cf658b3115b3f17bd0794 http://arxiv.org/abs/1809.00187 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....a2e57280e91cf658b3115b3f17bd0794 |
| قاعدة البيانات: | OpenAIRE |
| الوصف غير متاح. |