NOAO >   Observing Info >   Approved Programs >   2010B-0075

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Proposal Information for 2010B-0075


PI: John R. Stauffer, California Institute of Technology, stauffer@ipac.caltech.edu
Address: Spitzer Science Center, Mail Code 100-22, Pasadena, CA 91125, USA

CoI: Deokkeun An, Ewha W. University, Seoul, Korea

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 that a number of young field stars in the solar neighborhood should be sub-luminous at a given photospheric abundance (i.e. they should have the "Pleiades disease"). 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. This is a continuation of a program approved for 2010A (observations scheduled for May 2010), to cover the other half of the northern sky.


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