NOAO >   Observing Info >   Approved Programs >   2012A-0246

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Proposal Information for 2012A-0246


PI: Hakeem M. Oluseyi, Florida Institute of Technology, holuseyi@fit.edu
Address: Physics Department, 150 W. University Ave., Melbourne, FL 32901, USA

CoI: Zeljko Ivezic, University of Washington

Title: Multi-Color Photometry of New SX Phe Stars

Abstract: Fewer than 20 field SX Phe stars have been discovered. Using the newly calibrated LINEAR database our collaboration has discovered over 100 new candidate field SX Phe stars. We have used archival SDSS spectra and have obtained new spectra to positively confirm 25 stars as being population II. Unfortunately, the LINEAR survey utilized a single broadband filter (essentially white light). We propose here to obtain B, V, R, I time-series photometry of several of these objects to extract stellar parameters and characterize this new population of stars. Beside characterizing the SX Phe stars, which are an interesting example of post-collisional pulsating stars, we may compare the metallicities of these objects with that of the halo, thus informing Galactic formation and evolution schemes.


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NOAO >   Observing Info >   Approved Programs >   2012A-0246

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