NOAO >   Observing Info >   Approved Programs >   2003B-0003

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Proposal Information for 2003B-0003


PI: Arlo U. Landolt, Louisiana State University, landolt@baton.phys.lsu.edu
Address: Dept. of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803-4001, U.S.A.

CoI: George W. Preston, Carnegie Institution of Washington

Title: A Study of Variability Among the Blue Metal Poor Stars

Abstract: The blue metal poor (BMP) stars of interest in this proposal are stars whose [Fe/H] < -1.0. Preston's long-term spectrographic program at Las Campanas has shown many of these stars to be variable in velocity. Initial observations by Landolt have shown that about one- half of the BMPs tested are variable in light. Telescope time is being requested to do photometry of selected BMPs with the following goals: to establish the pulsation amplitudes and periods of BMPs found to vary in light, to establish upper limits of pulsation amplitude for the remainder, to define the color boundaries of the BMP instability strip, to estimate the fraction of pulsators in this strip, and to compare the pulsation properties of the BMP stars with their Delta Scuti cousins in the solar neighborhood and the SX Phe stars in globular clusters. This current proposal is a continuation of the exploration of the instability strip for these stars.


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