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Accurate ρ̄ and log g of δ Sct stars using Asteroseismology

A. GarcŪa HernŠndez, M. J. P. F. G. Monteiro, G.-B. Zhao, D. R. Reese, J.-C. SuŠrez, S. R. Martin, J. Pascual Granado, A. Moya, R. Garrido

In this work, we present a new method to determine the surface gravity of δ Sct stars. We used a refined Δν=ρ̄ relation and the stellar parallaxes or luminosities to determine their masses and radii. A comparison with the data obtained from the binary analysis, has shown that the values found by both methods are equivalent, within the uncertainties. Moreover, thanks to the refined relation, the uncertainties in log g are of the order of those usually estimated with high-resolution spectroscopy. Because of that, this new method to determine the surface gravity is an important step forward to break the degeneracy problem in the spectroscopic analysis.

Seismology of the Sun and the Distant Stars 2016 – Using Today’s Successes to Prepare the Future – TASC2 & KASC9 Workshop – SPACEINN & HELAS8 Conference
M.J.P.F.G. Monteiro, M.S. Cunha, J.M.T.S. Ferreira

EPJ Web of Conferences
Volume 160, Number 0300
2017 October

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Instituto de Astrof√≠sica e Ci√™ncias do Espa√ßo Universidade do Porto Faculdade de Ciências da Universidade de Lisboa
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia