Abstract
We present the results of modelling the subgiant star β 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 β 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.
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References
Bedding, T.R., Butler, R.P., Kjeldsen, H., et al.: Astrophys. J. 549, L105 (2001)
Bedding, T.R., Kjeldsen, H., Arentoft, T., et al.: Astrophys. J. 663, 1315 (2007)
Christensen-Dalsgaard, J.: Sol. Phys. 220, 137 (2004)
Christensen-Dalsgaard, J.: Astrophys. Space Sci. 316, 13 (2008a)
Christensen-Dalsgaard, J.: Astrophys. Space Sci. 316, 113 (2008b)
Di Mauro, M.P., Christensen-Dalsgaard, J., Paternò, L.: Astrophys. Space Sci. 284, 229 (2003)
Fernandes, J., Monteiro, M.J.P.F.G.: Astron. Astrophys. 399, 243 (2003)
Kjeldsen, H., Bedding, T.R., Christensen-Dalsgaard, J.: Astrophys. J. 683, L175 (2008)
North, J.R., Davis, J., Bedding, T.R., et al.: Mon. Not. R. Astron. Soc. 380, L80 (2007)
Santos, N.C., Israelian, G., Mayor, M., et al.: Astron. Astrophys. 437, 1127 (2005)
van Leeuwen, F.: Hipparcos, the New Reduction of the Raw Data, Astrophys. Space Sci. Library, vol. 350 (2007)
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Doğan, G., Brandão, I.M., Bedding, T.R. et al. Asteroseismic modelling of the solar-like star β Hydri. Astrophys Space Sci 328, 101–104 (2010). https://doi.org/10.1007/s10509-009-0225-1
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DOI: https://doi.org/10.1007/s10509-009-0225-1