Brogaard, K., Hansen, C. J., Miglio, A., Slumstrup, D., Frandsen, S., Jessen-Hansen, J., Lund, M. N., Bossini, D., Thygesen, A., Davies, G. R., Chaplin, W. J., Arentoft, T., Bruntt, H., Grundahl, F., Handberg, R.
Establishing the accuracy of asteroseismic mass and radius estimates of giant stars. I. Three eclipsing systems at [Fe/H]~-0.3 and the need for a large high-precision sample.
Monthly Notices of the Royal Astronomical Society
Abstract
We aim to establish and improve the accuracy level of asteroseismic estimates of mass, radius, and age of giant stars. This can be achieved by measuring independent, accurate, and precise masses, radii, effective temperatures and metallicities of long period eclipsing binary stars with a red giant component that displays solar-like oscillations. We measured precise properties of the three eclipsing binary systems KIC 7037405, KIC 9540226, and KIC 9970396 and estimated their ages be 5.3 ± 0.5, 3.1 ± 0.6, and 4.8 ± 0.5 Gyr. The measurements of the giant stars were compared to corresponding measurements of mass, radius, and age using asteroseismic scaling relations and grid modeling. We found that asteroseismic scaling relations without corrections to Δν systematically overestimate the masses of the three red giants by 11.7%, 13.7%, and 18.9%, respectively. However, by applying theoretical correction factors f
Keywords: binaries: eclipsing, stars: fundamental parameters, stars: evolution, Galaxy: stellar content, stars: individual: KIC 7037405, KIC 9540226, KIC 9970396
