Accurate and log g of δ Sct stars using Asteroseismology

¹ Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, PT, 4150-762, Porto, Portugal
² Departamento de Física e Astronomia, Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre, 4169-007, Porto, Portugal
³ Center for High Angular Resolution Astronomy and Department of Physics and Astronomy, Georgia State University, P. O. Box 5060USA, GA 30302-5060 Atlanta, USA
⁴ LESIA, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ. Paris 06, Univ. Paris Diderot, Sorbonne Paris Cité, 92195, Meudon, France
⁵ Universidad de Granada. Dept. Física Teórica y de Cosmos. Fuentenueva Campus. 18007 Granada, Spain
⁶ Instituto de Astrofísica de Andalucía (CSIC), Glorieta de la Astronomía S/N, 18008, Granada, Spain
⁷ Universidad Internacional de Valencia - VIU. C/Gorgos 5-7. Valencia. Spain

^* e-mail: agh@astro.up.pt

Published online: 27 October 2017

Abstract

In this work, we present a new method to determine the surface gravity of δ Sct stars. We used a refined 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.