Asteroseismic modelling of the solar-like star beta Hydri

• Tipo: Artigo em Revista Científica Internacional
• Data: 2010

Autores

G. Dogan (Autor) FCUP; I.M. Brandao (Autor) FCUP; T.R. Bedding (Autor) FCUP; J. Christensen-Dalsgaard (Autor) FCUP; M.S. Cunha (Autor) FCUP; H. Kjeldsen (Autor) FCUP

Revista

Título: Astrophysics and Space Science

Vol. 328 Nº 1-2

Páginas: 101-104

ISSN: 0004-640X

Editora: Springer Nature

Indexação

ISI Web of Science

Classificação Científica

FOS: Ciências exactas e naturais > Física

Outras Informações

Abstract (EN): We present the results of modelling the sub-giant star beta Hydri using seismic observational constraints. We have computed several grids of stellar evolutionary tracks using the Aarhus STellar Evolution Code (ASTEC, Christensen-Dalsgaard in Astrophys. Space Sci. 316:13, 2008a), with and without helium diffusion and settling. For those models on each track that are located at the observationally determined position of) beta Hydri in the Hertzsprung-Russell (HR) diagram, we have calculated the oscillation frequencies using the Aarhus adiabatic pulsation package (ADIPLS, Christensen-Dalsgaard in Astrophys. Space Sci. 316:113, 2008b). Applying the near-surface corrections to the calculated frequencies using the empirical law presented by Kjeldsen et al. (Astrophys. J. 683:L175, 2008), we have compared the corrected model frequencies with the observed frequencies of the star. We show that after correcting the frequencies for the near-surface effects, we have a fairly good fit for both l = 0 and l = 2 frequencies. We also have good agreement between the observed and calculated l = 1 mode frequencies, although there is room for improvement in order to fit all the observed mixed modes simultaneously.

Idioma: Inglês

Tipo (Avaliação Docente): Científica