The MuGSHoTS Program, Multiplicity for Galactic Stars of the Halo and Traceable Systems: First Detection of Low-mass, Metal-Poor Pairs with Mappable Orbits.

Details The MuGSHoTS Program, Multiplicity for Galactic Stars of the Halo and Traceable Systems: First Detection of Low-mass, Metal-Poor Pairs with Mappable Orbits. The MuGSHoTS Program, Multiplicity for Galactic Stars of the Halo and Traceable Systems: First Detection of Low-mass, Metal-Poor Pairs with Mappable Orbits.

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21722606l&link_type=abstract

American Astronomical Society, AAS Meeting #217, #226.06; Bulletin of the American Astronomical Society, Vol. 43, 2011

Physics

Optics

Scientific paper

We present the first results from the MuGSHoTS program, a systematic search for double/multiple systems in a well-defined sample of 1,000 Galactic halo stars (high-velocity subdwarfs) located within 80 parsecs of the Sun. The survey combines wide field, common proper motion searches with high-resolution adaptive optics imaging from the Lick and Keck observatories, and additional imaging data from the Hubble Space Telescope. The primary goals are to (A) calculate the multiplicity fraction among low-mass halo stars in order to study the formation and survivability of Pop.II binaries, and (B) identify benchmark systems in which the masses of old, metal-poor stars could be directly measured by monitoring the orbital motion of the components. We report the discovery and confirmation of four relatively tight binary systems with projected orbital separations <100AU and very cool, low-mass stellar components (late-M subdwarfs).
Support for this program was provided by NASA through a grant from the Space Telescope Science Institute, operated by AURA Inc., under NASA contract NAS5-26555, and though a grant from the California Institute of Technology, Jet Propulsion Laboratory.

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