NOAO >   Observing Info >   Approved Programs >   2010A-0305

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Proposal Information for 2010A-0305


PI: Deokkeun An, California Institute of Technology, deokkeun@ipac.caltech.edu
Address: Infrared Processing and Analysis Center, Mail Code 100-22, Pasadena, CA 91125, USA

CoI: John R. Stauffer, SSC/Caltech

Title: Pleiades-like Stars in the \it Hipparcos Catalog

Abstract: The tension between the \it Hipparcos parallax of the Pleiades and other independent distance estimates continues even after the new reduction of the \it Hipparcos astrometric data. A short Pleiades distance from the \it Hipparcos parallax predicts a number of stars in the solar neighborhood that are sub-luminous at a given photospheric abundance. We propose to obtain spectroscopic abundances for a subset of stars in the \it Hipparcos catalog, which occupy the same region as the Pleiades in the color-magnitude diagram, and to directly test this hypothesis. Failure to find any such sub-luminous, young solar metallicity stars would strongly contradict the \it Hipparcos Pleiades distance.


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NOAO >   Observing Info >   Approved Programs >   2010A-0305

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