期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 485, 期 3, 页码 4052-4059出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stz681
关键词
techniques: spectroscopic; Sun: abundances; stars: abundances; stars: evolution; planetary systems; stars: solar-type
资金
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior - Brasil (CAPES) [001]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [2014/18100-4, 2018/04055-8]
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq, Bolsa de Produtividade)
- European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program (project FOUR ACES) [724427]
- European Organisation for Astronomical Research in the Southern Hemisphere under ESO programs [188.C-0265, 183.D-0729, 292.C-5004, 097.C-0571, 092.C-0721, 093.C-0409, 072.C-0488, 183.C-0972, 091.C-0936, 192.C-0852]
- [196.C-1006]
- [076.C-0155]
- [096.C-0499]
- [185.D-0056]
- [192.C-0224]
- [075.C-0332]
- [090.C-0421]
- [091.C-0034]
- [077.C-0364]
- [089.C-0415]
- [60.A-9036]
- [092.C-0832]
- [295.C-5035]
- [295.C-5031]
- [60.A-9700]
- [289.D-5015]
- [096.C-0210]
- [086.C-0284]
- [088.C-0323]
- [0100.D-0444]
- [099.C-0491]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [18/04055-8, 14/18100-4] Funding Source: FAPESP
This work aims to examine in detail the depletion of lithium in solar twins to better constrain stellar evolution models and investigate its possible connection with exoplanets. We employ spectral synthesis in the region of the asymmetric 6707.75 angstrom Li I line for a sample of 77 stars plus the Sun. As in previous works based on a smaller sample of solar twins, we find a strong correlation between Li depletion and stellar age. In addition, for the first time we show that the Sun has the lowest Li abundance in comparison with solar twins at similar age (4.6 +/- 0.5 Gyr). We compare the lithium content with the condensation temperature slope for a subsample of the best solar twins and determine that the most lithium-depleted stars also have fewer refractory elements. We speculate whether the low lithium content in the Sun might be related to the particular configuration of our Solar system.
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