NOAO >   Observing Info >   Approved Programs >   2004A-0057

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Proposal Information for 2004A-0057


PI: Ronald L. Gilliland, Space Telescope Science Institute, gillil@stsci.edu
Address: 3700 San Martin Drive, Baltimore, MD 21218, USA

CoI: Dennis Stello, School of Physics, Univ. of Sydney
CoI: Hans Kjeldsen, Aarhus University, Denmark
CoI: Soeren Frandsen, Aarhus University, Denmark
CoI: Tim Bedding, School of Physics, University of Sydney

Title: The M67 K Giant Project

Abstract: Observations of solar-like oscillations have finally started to provide excellent results with firm detections in recent years for the dwarf solar-analogue (alpha) Cen, the mildly evolved subgiant (beta) Hyi, and the G giant star \xi Hya, which lies at the base of the red giant branch. We are now poised to further exploit these recent successes with a systematic exploration. The giants are of particular interest as allowing tests of evolution and structure theory in this complicated time in a stars life, while presenting observational signals conducive to study with modest photometric observations. This program will be a key part of a multi-longitude, international campaign organized by the listed co-Is to measure stellar oscillations in the red giants of the nearby open cluster M67. Adding KPNO to the existing allocations of time would assure (weather cooperating) observations without gaps for a substantial number of days as needed for robust asteroseismology. We aim at a detection level and a frequency resolution that will enable us to test the predicted excitation amplitudes and to resolve individual modes. This will allow us to test models of evolved low-mass stars much more thoroughly than has been possible to date by combining precise mode frequencies with the additional constraints provided by the known metallicity and distance of the cluster stars.


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NOAO >   Observing Info >   Approved Programs >   2004A-0057

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