The Li-age correlation: The Sun is unusually Li deficient for its age

M. Carlos; J. Meléndez; L. Spina; L. A. Dos Santos; M. Bedell; I. Ramirez; M. Asplund; J. L. Bean; D. Yong; J. Yana Galarza; A. Alves-Brito

doi:10.1093/mnras/stz681

The Li-age correlation: The Sun is unusually Li deficient for its age

M. Carlos, J. Meléndez, L. Spina, L. A. Dos Santos, M. Bedell, I. Ramirez, M. Asplund, J. L. Bean, D. Yong, J. Yana Galarza, A. Alves-Brito

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Abstract

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 Å 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.

Original language	English
Pages (from-to)	4052-4059
Number of pages	8
Journal	Monthly Notices of the Royal Astronomical Society
Volume	485
Issue number	3
DOIs	https://doi.org/10.1093/mnras/stz681
Publication status	Published - 28 Feb 2019

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title = "The Li-age correlation: The Sun is unusually Li deficient for its age",

abstract = "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 {\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 ± 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.",

keywords = "Planetary systems, Stars: abundances, Stars: evolution, Stars: solar-type, Sun: abundances, Techniques: spectroscopic",

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T2 - The Sun is unusually Li deficient for its age

AU - Carlos, M.

AU - Meléndez, J.

AU - Spina, L.

AU - Dos Santos, L. A.

AU - Bedell, M.

AU - Ramirez, I.

AU - Asplund, M.

AU - Bean, J. L.

AU - Yong, D.

AU - Yana Galarza, J.

AU - Alves-Brito, A.

PY - 2019/2/28

Y1 - 2019/2/28

N2 - 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 Å 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.

AB - 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 Å 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.

KW - Planetary systems

KW - Stars: abundances

KW - Stars: evolution

KW - Stars: solar-type

KW - Sun: abundances

KW - Techniques: spectroscopic

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U2 - 10.1093/mnras/stz681

DO - 10.1093/mnras/stz681

M3 - Article

SN - 0035-8711

VL - 485

SP - 4052

EP - 4059

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 3

ER -

The Li-age correlation: The Sun is unusually Li deficient for its age

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