Lithium depletion in solar analogs: age and mass effects

Autor(es)

Rathsam, Anne ; Melendez, Jorge ; Silva, Gabriela Carvalho

• Tipo de documento: Artigo Científico
• Fonte: Monthly Notices of the Royal Astronomical Society; v. 525, n. 3, p. 15-pg., 2023-09-08.

Resumo

The main goal of this work is to evaluate the correlation between Li abundance, age, and mass. Using high-quality ESO/HARPS data (R similar or equal to 115 000; 270 <= SNR <= 1000), we measured Li abundances via spectral synthesis of the 6707.8 & Aring; Li-7 line in 74 solar twins and analogs. Our joint analysis of 151 Sun-like stars (72 from our sample plus 79 solar twins from a previous study) confirms the strong Li abundance-age correlation reported by other works. Mass and convective envelope size also seem to be connected with Li abundance but with lower significance. We have found a link between the presence of planets and low Li abundances in a sample of 192 stars with a high significance. Our results agree qualitatively with non-standard models, and indicate that several extra transport mechanisms must be taken into account to explain the behaviour of Li abundance for stars with different masses and ages. (AU)

• Processo FAPESP: 19/19208-7 - Uma nova amostra para a busca de planetas habitáveis
• Beneficiário: Anne Viegas Rathsam
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• 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
• Processo FAPESP: 20/15789-2 - Depleção de lítio em estrelas de baixa massa
• Beneficiário: Anne Viegas Rathsam
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica