NOAO >   Observing Info >   Approved Programs >   2002A-0177

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Proposal Information for 2002A-0177


PI: Wei-Chun Jao, Georgia State University, jao@chara.gsu.edu
Address: 1 Park Place, \#730, Atlanta, GA 30303

CoI: Todd Henry, Georgia State University
CoI: John Subasavage, Georgia State University
CoI: Jacob Bean, Georgia Institute of Technology

Title: Investigating the Highest Proper Motion Stars

Abstract: There currently are 601 stars (502 systems) with proper motion faster than 1\arcsec/year (hereafter, MOTION stars). Among these MOTION stars, there are 186 systems (37%) without complete VRI photometric information on a standard system. We propose to obtain VRI band photometry from both CTIO and KPNO in order to characterize these stars. 75% of MOTION stars are estimated to lie within 25 pc of the Sun. These results will allow us to understand the colors, temperatures and luminosities for these fast moving objects and provide a complete picture of this definitive sample. \it The complete characterization of this sample comprises the thesis project of PI Jao. \vskip15pt By obtaining VRI photometry for the MOTION stars , we will be able to identify new nearby star candidates for our second generation parallax project, CTIOPI2, planned as part of the new small telescope consortium at CTIO. The frames taken can be used to evaluate appropriate setup frames for future astrometry series. We also expect to discover new companions in the photometry frames. These companions can be identified by (1) confirming common proper motion using DSS frames and/or (2) initiating deep photometric searches by combining the VRI data with JHK photometry of nearby sources in 2MASS. Both types of new companions will contribute to our growing database that is being used to investigate the stellar multiplicity rate. Finally, the VRI photometry will allow us to identify the less common subdwarfs, white dwarfs or close binaries, many of which will be added to the lists of new nearby stars that will be the targets for future space missions such as SIM and TPF.


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