Other
Scientific paper
Aug 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005noao.prop..124l&link_type=abstract
NOAO Proposal ID #2005B-0124
Other
Scientific paper
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 showed that three of the BMPs tested were variable in light. Limited data from this effort indicate that several other BMPs are suspected to be light variables. 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 photometric exploration of the instability strip for these stars, essential to complement the in hand spectroscopic data. These requested runs should complete the project.
Landolt Arlo U.
Preston George W.
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