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Precise surface gravities of δ Scuti stars from asteroseismology

Antonio García Hernández1Department of Theoretical Physics and Cosmology, University of Granada (UGR), E-18071 Granada, SpainJ. C. Suárez1Department of Theoretical Physics and Cosmology, University of Granada (UGR), E-18071 Granada, SpainA. Moya1Department of Theoretical Physics and Cosmology, University of Granada (UGR), E-18071 Granada, SpainM. J. P. F. G. Monteiro2Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, P-4150-762 Porto, PortugalZhao Guo5Copernicus Astronomical Center, PAN, Bartycka 18, PL-00-716 Warsaw, PolandD R Reese7LESIA, Observatoire de Paris, PSL Research University, CNRS, Sorbonne Universités, UPMC Univ. Paris 06, Univ. Paris Diderot, Sorbonne Paris Cité, 5 place Jules Janssen, F-92195 Meudon, FranceJ. Pascual-Granado3Instituto de Astrofísica de Andalucía (CSIC), Glorieta de la Astronomía S/N, E-18008 Granada, SpainS. Barceló Forteza8Instituto de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, SpainS. Martín‐Ruiz3Instituto de Astrofísica de Andalucía (CSIC), Glorieta de la Astronomía S/N, E-18008 Granada, SpainR. Garrido3Instituto de Astrofísica de Andalucía (CSIC), Glorieta de la Astronomía S/N, E-18008 Granada, SpainJ.-L. Nieto

2017en

ABI

Annotatsiya

Abstract The work reported here demonstrates that it is possible to accurately determine surface gravities of δ Scuti (δ Sct) stars using the frequency content from high-precision photometry and a measurement of the parallax. Using a sample of 10 eclipsing binary systems with a δ Sct component and the unique δ Sct star discovered with a transiting planet, WASP-33, we were able to refine the Δν–$\bar{\rho }$ relation. Using this relation and parallaxes, we obtained independent values for the masses and radii, allowing us to calculate the surface gravities without any constraints from spectroscopic or binary analysis. A remarkably good agreement was found between our results and those published, extracted from the analysis of the radial velocities and light curves of the systems. This reinforces the potential of Δν as a valuable observable for δ Sct stars and settles the degeneracy problem for the log g determination through spectroscopy.

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DOI: 10.1093/mnrasl/slx117

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