NOAO >   Observing Info >   Approved Programs >   2013B-0044

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Proposal Information for 2013B-0044


PI: Joerg Weingrill, Leibniz-Institute for Astrophysics Potsdam, jweingrill@aip.de
Address: Cosmic Magnetic Fields, An der Sternwarte 16, Potsdam 14482, Germany

CoI: Aaron Geller, Northwestern University
CoI: Klaus Strassmeier, Leibniz-Institute for Astrophysics
CoI: Sydney Barnes, Space Science Institute
CoI: Soeren Meibom, Harvard-Smithsonian CfA
CoI: Thomas Granzer, Leibniz-Institute for Astrophysics
CoI: Federico Spada, Leibniz-Institute for Astrophysics

Title: Radial velocity membership for the open cluster IC4756

Abstract: IC 4756 is an ~800 Myr-old nearby (500 pc) open cluster that conveniently splits the difference in age between the well-studied Hyades (625 Myr) and NGC 6811 (1 Gyr) clusters. As a result, measuring IC 4756 rotation periods offers us the chance to test the universality of the intermediate-age rotational evolution of stars independent of any theoretical models. Therefore we have performed precision time-series photometry of the IC 4756 field with the CoRoT satellite, and derived 111 main sequence rotation periods in the cluster region. We have also acquired new multicolor Stromgren photometry of the cluster. However, heavy differential reddening and imprecise membership information do not yet allow a satisfactory determination of the cluster parameters and membership, far less interpretation of the rotation periods. We propose here to use WIYN+Hydra to securely identify the cluster members, determine the cluster parameters, and to fully interpret the corresponding color-period diagram. This work will provide a new benchmark open cluster for the community, and help to develop the associated study of stellar rotation and gyrochronology.


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