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Frank Grundahl

The Open Cluster NGC 6811: An Eclipsing Binary, the Turnoff, and Age

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Thanks to its extended study during the original Kepler mission, we have an abundance of new data on the intermediate age (∼1 Gyr) cluster NGC 6811. NGC 6811 is currently the oldest cluster with a fully studied population of rotating stars being used to calibrate gyrochronology relations. The cluster's turnoff also falls completely within the instability strip, and the majority of the brightest main sequence stars have now been identified as δ Scuti pulsators. The eclipsing binary KIC 9777062/Sanders 195 is a cluster member slightly fainter than the turnoff, containing one star that falls within the instability strip. A thorough study of the binary can therefore calibrate the masses and luminosities of the cluster's pulsating stars. We use the characteristics of the binary star components in concert with a re-examination of the photometric properties of the cluster's turnoff and giant stars to produce an improved age determination.We gratefully acknowledge support from the NSF to E.L.S. under grant AST-0908536 and for M.L. as part of the REU program at San Diego State University under grant AST-0850564, and from NASA under grants NNX12AC88G and NNX13AC19G.
Original languageEnglish
Publication year1 Jan 2015
Publication statusPublished - 1 Jan 2015
EventAmerican Astronomical Society, AAS Meeting -
Duration: 1 Jan 20151 Jan 2015
Conference number: 225


ConferenceAmerican Astronomical Society, AAS Meeting

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