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

TL;DR

This study used speckle interferometry with a 6-m telescope to observe 109 metal-poor stars, resolving multiple systems and providing new astrometric data on their multiplicity.

Contribution

First-time resolution of seven metal-poor stars into multiple components, including new triple and quadruple systems, expanding knowledge of stellar multiplicity in this population.

Findings

Resolved 8 stars into individual components.

Identified 2 triple and 1 quadruple systems.

Multiplicity ratio among observed stars is 71:28:6:1.

Abstract

We report the results of speckle-interferometric observations of 109 high proper-motion metal-poor stars made with the 6-m telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences. We resolve eight objects -- G102-20, G191-55, BD+19$^\circ$~1185A, G89-14, G87-45, G87-47, G111-38, and G114-25 -- into individual components and we are the first to astrometrically resolve seven of these stars. New resolved systems included two triple (G111-38, G87-47) and one quadruple (G89-14) star. The ratio of single-to-binary-to-triple-to-quadruple systems among the stars of our sample is equal to 71:28:6:1.