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

Autor(es):Mostrar menos -

Carlos, M. ^[1] ; Melendez, J. ^[1] ; Spina, L. ^[2] ; dos Santos, L. A. ^[3] ; Bedell, M. ^[4] ; Ramirez, I. ^[5] ; Asplund, M. ^[6] ; Bean, J. L. ^[7] ; Yong, D. ^[6] ; Yana Galarza, J. ^[1] ; Alves-Brito, A. ^[8]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, IAG, Dept Astron, Rua Matao 1226, BR-05509900 Sao Paulo - Brazil

^[2] Monash Univ, Sch Phys & Astron, Monash Ctr Astrophys, Clayton, Vic 3800 - Australia

^[3] Observ Univ Geneve, 51 Chemin Maillettes, CH-1290 Versoix - Switzerland

^[4] Flatiron Inst, Ctr Computat Astrophys, 162 5th Ave, New York, NY 10010 - USA

^[5] Tacoma Community Coll, 6501 South 19th St, Tacoma, WA 98466 - USA

^[6] Australian Natl Univ, Res Sch Astron & Astrophys, Cotter Rd, Canberra, ACT 2611 - Australia

^[7] Dept Astron & Astrophys, 5640 S Ellis Ave, Chicago, IL 60637 - USA

^[8] Univ Fed Rio Grande do Sul, Inst Fis, Av Bento Goncalves 9500, BR-90040060 Porto Alegre, RS - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Monthly Notices of the Royal Astronomical Society; v. 485, n. 3, p. 4052-4059, MAY 2019.
• Citações Web of Science: 1

Resumo

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. (AU)

• Processo FAPESP: 14/18100-4 - Populações estelares na Via Láctea: bojo, halo, disco e regiões de formação de estrelas; instrumentação para espectroscopia de alta resolução
• Beneficiário: Beatriz Leonor Silveira Barbuy
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 18/04055-8 - Espectroscopia de alta precisão: das primeiras estrelas aos planetas
• Beneficiário: Jorge Luis Melendez Moreno
• Modalidade de apoio: Auxílio à Pesquisa - Temático