EDP Sciences
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Volume 399, Number 1, February III 2003
Page(s) 243 - 251
Section Stellar atmospheres
DOI http://dx.doi.org/10.1051/0004-6361:20021771

A&A 399, 243-251 (2003)
DOI: 10.1051/0004-6361:20021771

HR diagram and asteroseismic analysis of models for $\beta$ Hydri

J. Fernandes1 and M. J. P. F. G. Monteiro2, 3

1  Observatório Astronómico da Universidade de Coimbra e Departamento de Matemática, FCTUC, Portugal
    e-mail: jmfernan@mat.uc.pt
2  Departamento de Matemática Aplicada, Faculdade de Ciências da Universidade do Porto, Portugal
3  Centro de Astrofísica da Universidade do Porto, Rua das Estrelas, 4150-762 Porto, Portugal

(Received 29 April 2002 / Accepted 14 November 2002)

A detailed review of the models for the star $\beta~Hydri$ is done by adjusting the evolutionary sequences to the most recent bolometric, spectroscopic and astrometric data. The dependence of the solution on some of the relevant modelling parameters is analysed and the degeneracy of the solution using the HR diagram analysis discussed.

Recent ground-based observations, and the forthcoming asteroseismic missions, can provide detailed oscillation spectra for this star. The seismic data can be used as a complementary constraint on the models. We analyse the seismic properties of the star and discuss the viability of using such complementary tests in order to clarify some of the degeneracy of the model solutions. Preliminary results on the fundamental parameters of $\beta~Hydri$ are presented and the expected seismic behaviour of the star is described.

Key words: stars: evolution -- stars: fundamental parameters -- stars: individual: $\beta$ Hydri -- stars: oscillations

Offprint request: M. J. Monteiro, mjm@astro.up.pt

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