NOAO > Observing Info > Approved Programs > 2008A-0304
|
NOAO > Observing Info > Approved Programs > 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.
National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360
|
NOAO > Observing Info > Approved Programs > 2008A-0304 |
|