Asteroseismic modelling of the solar-like star beta Hydri

• Type: Article in International Scientific Journal
• Date: 2010

Authors

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

Journal

Title: Astrophysics and Space Science

Vol. 328 No. 1-2

Pages: 101-104

ISSN: 0004-640X

Publisher: Springer Nature

Indexing

ISI Web of Science

Scientific classification

FOS: Natural sciences > Physical sciences

Other information

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.

Language: English

Type (Professor's evaluation): Scientific