NOAO >   Observing Info >   Approved Programs >   2008A-0304

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Proposal Information for 2008A-0304


PI: Wei-Chun Jao, Georgia State University, jao@chara.gsu.edu
Address: Physics Department, P.O. Box 4106, Atlanta, GA 30302, USA

CoI: Todd Henry, Georgia State University

Title: Cool Subdwarf Investigations (CSI): Multiplicity

Abstract: The multiplicity of cool subdwarfs appears to be less than that of cool dwarfs. However, many cool subdwarf companion surveys show that their multiplicity rates are different from what theoretical models predict. In order to fully understand cool subdwarf's multiplicity, we propose two different observations. First, we propose to use Gemini North's LGS-AO system to search for any astrometric companions to nearby cool subdwarfs within 60 pc which are too faint to be observed by any other ground based high resolution technique. Second, we propose to use KPNO 4m spectroscopic time to confirm the identities of 65 wide common proper motion cool subdwarf pairs. Consequently, we could complete our high resolution companion surveys on the volume-limited cool subdwarf sample and understand what the binary fractions are for close and widely separated subdwarfs.


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NOAO >   Observing Info >   Approved Programs >   2008A-0304

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