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Asteroseismology of Red Giant Stars: a Tool for Determining Stellar Properties

Diego Bossini

Asteroseismology have opened the door to detailed studies of the near-core structure of low-mass stars, which had not been possible before. Thank to the new constraints it provides, it is now possible to greatly improve our measurements of the basic stellar properties of field and clusters giants observed far across the Galaxy. Most of such determinations of ages and masses are, up to now, based on simple scaling relations, involving the average large frequency separation (Dnu) and the frequency of maximum power (numax).
The use of observed Dnu and the period spacing of gravity mode can set precise constrains on the physics of stellar models, and their inclusion in detailed grids of isochrones improves parameter estimation through Bayesian method.
Tests with synthetic data reveal that masses and ages can be determined with typical precision of 5 and 19 per cent, respectively, down to 3 and 10 per cent when we add independent information on the stellar luminosity.

2019 June 12, 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