New red giants in NGC 6791 and NGC 6819

These additional constraints on the ensemble of cluster stars make these stars suitable as benchmarks. We aimed (1) to identify previously unknown red giants in the open clusters NGC 6791 and NGC 6819, (2) to extract their asteroseismic parameters and (3) to determine their cluster membership.

We followed a state-of-the-art method based on difference imaging to extract the light curves of potential red giants in NGC 6791 and NGC 6819 from Kepler superstamp data. We extracted the asteroseismic parameters of the stars that showed solar-like oscillations. We performed an asteroseismic membership study to identify which of these stars are likely to be cluster members.