Solar twins in M 67: evolutionary status and lithium abundance

• Autor(a) principal: Castro, M.
• Data de Publicação: 2011
• Outros Autores: Nascimento Jr., J. D. do, Biazzo, K., Meléndez, J., Medeiros, José Renan de
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UFRN
• Texto Completo: https://repositorio.ufrn.br/jspui/handle/123456789/29001; https://doi.org/10.1051/0004-6361/201015034
• topic: Stars: fundamental parameters; Stars: abundances; Stars: evolution; Stars: interiors; Stars: solar-type

Aims. We determine the age and mass of the three best solar twin candidates in open cluster M 67 through lithium evolutionary models. Methods. We computed a grid of evolutionary models with non-standard mixing at metallicity [Fe/H] = 0.01 with the ToulouseGeneva evolution code for a range of stellar masses. We estimated the mass and age of 10 solar analogs belonging to the open cluster M 67. We made a detailed study of the three solar twins of the sample, YPB637, YPB1194, and YPB1787. Results. We obtained a very accurate estimation of the mass of our solar analogs in M 67 by interpolating in the grid of evolutionary models. The three solar twins allowed us to estimate the age of the open cluster, which is 3.87+0.55 −0.66 Gyr, which is better constrained than former estimates. Conclusions. Our results show that the 3 solar twin candidates have one solar mass within the errors and that M 67 has a solar age within the errors, validating its use as a solar proxy. M 67 is an important cluster when searching for solar twins.