Speckle Interferometry of Metal-Poor Stars in the Solar Neighborhood.II

Abstract

The results of speckle interferometric observations of 115 metal-poor stars [m/H]<-1 within 250 pc from the Sun and with proper motions mu <= 0.2"/yr, made with the 6-m telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences, are reported. Close companions with separations ranging from 0.034" to 1" were observed for 12 objects - G76-21, G59-1, G63-46, G135-16, G168-42, G141-47, G142-44, G190-10, G28-43, G217-8, G130-7, and G89-14 - eight of them are astrometrically resolved for the first time. The newly resolved systems include one triple star - G190-10. If combined with spectroscopic and visual data, our results imply a single:binary:triple:quadruple star ratio of 147:64:9:1 for a sample of 221 primary components of halo and thick-disk stars.

References in corpus (4)

• Discovery of Five Very Low Mass Close Binaries, Resolved in the Visible with Lucky Imaging
• A CCD Imaging Search for Wide Metal-Poor Binaries
• Kinematics of Nearby Subdwarf Stars
• Speckle Interferometry of Metal-Poor Stars in the Solar Neighborhood. I

Cited by in corpus (5)

• The statistical properties of stars and their dependence on metallicity
• The statistical properties of stars and their dependence on metallicity: the effects of opacity
• The non-monotonic, strong metallicity dependence of the wide-binary fraction
• Multiplicity and period distribution of Population II field stars in solar vicinity
• Speckle Interferometry of Nearby Multiple Stars: 2007-2019 Positional Measurements and Orbits of Eight Objects