The Li–age correlation: the Sun is unusually Li deficient for its age
| Autor: | Carlos, M, Meléndez, J, Spina, L, A dos , L, Santos, Bedell, M, Ramirez, I, Asplund, M, L Bean, J, Yong, D, Yanaundefined, J, Galarza, Alves-Brito, A |
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| Rok vydání: | 2019 |
| Předmět: |
Solar System
FOS: Physical sciences evolution [Stars] chemistry.chemical_element Astrophysics solar-type [Stars] 01 natural sciences spectroscopic [Techniques] Correlation abundances [Sun] Evolucao estelar 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics Sistemas planetários 010303 astronomy & astrophysics Stellar evolution Solar and Stellar Astrophysics (astro-ph.SR) Line (formation) Physics Sol 010308 nuclear & particles physics Astronomy and Astrophysics Planetary system Exoplanet Planetary systems Stars Astrophysics - Solar and Stellar Astrophysics chemistry Space and Planetary Science abundances [Stars] Physics::Space Physics Lithium Lítio Astrophysics::Earth and Planetary Astrophysics |
| Zdroj: | Monthly Notices of the Royal Astronomical Society Repositório Institucional da UFRGS Universidade Federal do Rio Grande do Sul (UFRGS) instacron:UFRGS |
| ISSN: | 1365-2966 0035-8711 |
| Popis: | The present 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 \AA 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 $\pm$ 0.5 Gyr). We compare the lithium content with the condensation temperature slope for a sub-sample 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. Comment: Accepted for publication at MNRAS, 9 pages, 6 figures and 1 table |
| Databáze: | OpenAIRE |
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