3 juillet - 6 juillet 2018


S12 Synergie des grands surveys pour comprendre les étoiles : piliers de l’archéologie galactique

Red giants in eclipsing binaries: key systems to test asteroseismic scaling relations

M. Benbakoura, P. Gaulme, J. McKeever, P. G. Beck, R. A. García, S. Mathur, J. Jackiewicz

Given the potential of ensemble asteroseismology for understanding fundamental properties of large numbers of stars, it is critical to assess the accuracy of the relations on which these measurements are based. Eclipsing binaries hosting at least one star with detectable solar-like oscillations constitute ideal test objects. Indeed, the masses and radii of each component of a double-lined spectroscopic binary system can be determined by combining radial velocity measurements and photometric time series in which eclipses are visible. Today, nineteen binaries with at least one giant component have been found in the Kepler satellite’s data and studied through this method. The different teams working on this topic do not seem to agree on a conclusion: does asteroseismology overestimate stellar masses and radii? If so, how should we correct the scaling relations? In this work, we present sixteen new eclipsing binaries hosting a red giant. For those with detectable oscillations and companion’s radial velocity, we compare the seismic and dynamical masses and radii and test the corrections to the scaling relations proposed in the literature.