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Red-giant model degeneracies

Fernando J. G. Pinheiro

Stellar evolutionary models can be used, among other things, to estimate stellar masses and ages. This is achieved by comparing the position occupied by stars in the HR diagram (HRD) with model predictions.
On an earlier work it has been demonstrated that different combinations of modelling parameters can reproduce the position of a given sub-giant star in the HRD. This result increases the uncertainties associated with the global stellar parameters estimated using the approach mentioned above.
This presentation shows an extension of the previous study to low/intermediate mass (1-5Mo) red giants. In particular we will find model degeneracies that result from the use of different combinations of modelling parameters (such as the mixing length and overshooting). Additionally it will be discussed the possibility of breaking those degeneracies through the use of asteroseismic techniques.

2008 July 02, 13:30

Centro de Astrofísica da Universidade do Porto (Auditorium)
Rua das Estrelas, 4150-762 Porto

Faculdade de Ciências da Universidade de Lisboa Universidade do Porto Faculdade de Ciências e Tecnologia da Universidade de Coimbra
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia