The effect of stellar activity on the spectroscopic stellar parameters of the young solar twin HIP 36515
Tipo
Artigo
Data de publicação
2019
Periódico
Monthly Notices of the Royal Astronomical Society: Letters
Citações (Scopus)
35
Autores
Yana Galarza J.
Melendez J.
Lorenzo-Oliveira D.
Valio A.
Reggiani H.
Carlos M.
Ponte G.
Spina L.
Haywood R.D.
Gandolfi D.
Melendez J.
Lorenzo-Oliveira D.
Valio A.
Reggiani H.
Carlos M.
Ponte G.
Spina L.
Haywood R.D.
Gandolfi D.
Orientador
Título da Revista
ISSN da Revista
Título de Volume
Membros da banca
Programa
Resumo
© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society.Spectroscopic equilibrium allows us to obtain precise stellar parameters in Sun-like stars. It relies on the assumption of the iron excitation and ionization equilibrium. However, several works suggest that magnetic activity may affect chemical abundances of young active stars, calling into question the validity of this widely used method. We have tested, for the first time, variations in stellar parameters and chemical abundances for the young solar twin HIP 36515 (∼0.4 Gyr), along its activity cycle. This star has stellar parameters very well established in the literature and we estimated its activity cycle in ∼6 yr. Using HARPS spectra with high resolving power (115 000) and signal-to-noise ratio (∼270), the stellar parameters of six different epochs in the cycle were estimated. We found that the stellar activity is strongly correlated with the effective temperature, metallicity, and microturbulence velocity. The possibility of changes in the Li i 6707.8 Å line due to flares and star-spots was also investigated. Although the core of the line profile shows some variations with the stellar cycle, it is compensated by changes in the effective temperature, resulting in a non-variation of the Li abundance.