1. Precise surface gravities of δ Scuti stars from asteroseismology
- Author
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Mário J. P. F. G. Monteiro, J. Nieto, S. Barceló Forteza, A. Moya, Juan Carlos Suárez, A. García Hernández, Daniel R. Reese, Zhao Guo, J. Pascual-Granado, Susana Martín-Ruiz, R. Garrido, Institut Cavanilles de Biodiversitat i Biologia Evolutiva (ICBiBE), Universitat de València (UV), Departamento de Fitopatologia, University of Brasilia, Laboratoire SUBATECH Nantes (SUBATECH), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Nantes (UN)-Mines Nantes (Mines Nantes), Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Instituto de Astrofisica de Canarias (IAC), Instituto de Investigacion en Comunicacion Optica (IICO), and Universidad Autonoma de San Luis Potosi [México] (UASLP)
- Subjects
[PHYS]Physics [physics] ,Physics ,010504 meteorology & atmospheric sciences ,Binary number ,Astronomy ,Astronomy and Astrophysics ,Observable ,Astrophysics ,Light curve ,01 natural sciences ,Asteroseismology ,Stars ,Photometry (astronomy) ,Astrophysics - Solar and Stellar Astrophysics ,Space and Planetary Science ,Planet ,0103 physical sciences ,Content (measure theory) ,Astrophysics::Solar and Stellar Astrophysics ,Astrophysics::Earth and Planetary Astrophysics ,[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] ,010303 astronomy & astrophysics ,ComputingMilieux_MISCELLANEOUS ,Astrophysics::Galaxy Astrophysics ,0105 earth and related environmental sciences - Abstract
The work reported here demonstrates that it is possible to accurately determine surface gravities of $\delta$ 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 $\delta$ Sct component and the unique $\delta$ Sct star discovered with a transiting planet, WASP-33, we were able to refine the $\Delta\nu-\bar\rho$ 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 $\Delta\nu$ as a valuable observable for $\delta$ Sct stars and settles the degeneracy problem for the $\log g$ determination through spectroscopy., Comment: 5 pages, 2 figures, 1 table
- Published
- 2017