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Asteroseismology of stars in clusters has been a long-sought goal because theassumption of a common age, distance and initial chemical composition allowsstrong tests of the theory of stellar evolution. We report results from thefirst 34 days of science data from the Kepler Mission for the open cluster NGC6819 -- one of four clusters in the field of view. We obtain the first cleardetections of solar-like oscillations in the cluster red giants and are able tomeasure the large frequency separation and the frequency of maximum oscillationpower. We find that the asteroseismic parameters allow us to testcluster-membership of the stars, and even with the limited seismic data inhand, we can already identify four possible non-members despite their having abetter than 80% membership probability from radial velocity measurements. Weare also able to determine the oscillation amplitudes for stars that span abouttwo orders of magnitude in luminosity and find good agreement with theprediction that oscillation amplitudes scale as the luminosity to the power of0.7. These early results demonstrate the unique potential of asteroseismologyof the stellar clusters observed by Kepler.

Detection of solar-like oscillations from Kepler photometry of the open cluster NGC 6819