Leitner, Marika2; Sandquist, E. L.3; Shetrone, M. D.4; Brogaard, K. F.9; Jessen-Hansen, J.9; Meibom, S.5; Platais, I.6; Grundahl, F.9; Orosz, J. A.3; Bruntt, H.9; Stello, D.7; Frandsen, S.10
1 Department of Physics and Astronomy, Science and Technology, Aarhus University2 Humboldt State University3 San Diego State University4 McDonald Observatory5 Harvard-Smithsonian Center for Astrophysics6 Johns Hopkins University7 University of Sydney, Australia8 Department of Business Communication, Aarhus BSS, Aarhus University9 Department of Physics and Astronomy, Science and Technology, Aarhus University10 Department of Business Communication, Aarhus BSS, Aarhus University
The star KIC9777062 was discovered to be an eccentric eclipsing binary star via Kepler observations (Prsa et al. 2011). Because the system (also identified as Sanders 195) sits at the turnoff of the open cluster NGC 6811, precision measurement of the characteristics of the stars in the binary can provide an extremely precise age for the cluster. We present the results of modeling Kepler and ground-based photometry as well as radial velocities obtained at the Hobby-Eberly Telescope, Nordic Optical Telescope, and MMT. We demonstrate that the stars have masses near 1.6 and 1.4 solar masses with approximately 1% uncertainty, and smaller uncertainties for radius measurements. From comparing the masses and radii against theoretical isochrones, we will present an analysis of age and uncertainty. The results for this system will also produce a valuable test of the asteroseismic mass estimates for the red clump stars in the cluster (Stello et al. 2011). We gratefully acknowledge support from the NSF for M.L. as part of the REU program at San Diego State University under grant AST-0850564 and to E.L.S under grant AST-0908536, and NASA under grant NNX12AC88G.
American Astronomical Society Meeting Abstracts, 2013, Vol 221